Bio Bits: The Other Dogwoods The Other Dogwoods

As we eagerly await spring and the showy “blossoms” of the flowering dogwood (Cornus florida), many people may not realize that several other native dogwood species can be found in Connecticut’s woodlands, thickets, and wetlands. Though not as showy as the flowering dogwood, they all provide an abundance of late spring blossoms and summer fruit so important to insects and birds. It’s time to get to know and appreciate our lesser-known dogwoods.

Members of the dogwood family can be identified as such by their distinctive foliage: the primary veins on dogwood leaves radiate from the midrib in a curve toward the leaf tip. While the leaves of each species may differ in size and shape, their veins all form this same basic pattern. All of our local species have opposite leaves (leaves are paired opposite one another along the branch), except for the alternate-leaved dogwood (Cornus alternifolia), which, as its name suggests, bears leaves that alternate along its stems. 

Silky dogwood leaves and flower.

Clusters of small green or white flowers form on the ends of the branches, but unlike those of the flowering dogwood, our other dogwoods’ flowers are not surrounded by large white or pink bracts. Most bear flat-topped flower clusters, except for the gray dogwood (Cornus racemosa), which has loose cone-shaped clusters. Several species of native bees, wasps, butterflies, and beetles find dogwood blossoms irresistible. While the insects busily feed on nectar and pollen, they help to pollinate the plants, which can then produce fruit.

Silky dogwood fruit

Most of these dogwoods are considered shrubs, varying in size from only three to ten feet tall. Again, the exception is the alternate-leaved, which can reach heights of twenty-five feet in its upland woodland habitat. While not gaining the height of their cousin, the red osier dogwood (Cornus sericea) and gray dogwood will spread to form thickets. A welcomed sight in winter, the red osier’s striking red branches provide some much-needed color along a chilly stream or woodland swamp. The silky dogwood (Cornus amomum) also thrives in wet areas and bears blue berry-like clusters of fruits, while the red osier’s fruits are an opaque white. White fruit on red stalks identifies the gray dogwood along hedgerows and thickets; the alternate-leaved dogwood’s mature fruit is a deep purple on red stalks. 

Whether red, white, blue, or purple, a dogwood’s fruit will provide an important food for local and migrating birds this summer and fall. Wood ducks, wild turkeys, northern flickers, eastern bluebirds, and northern cardinals are some of the colorful avian visitors attracted to dogwoods.

We will be offering both silky dogwood and red osier dogwood for sale this spring at our Native Plant Sale for the Birds. Please visit our website for ordering information.

Submitted by Cindi Kobak

Photos: www.hort.uconn.edu/plants

(From the March 2012 Newsletter)

Citizen Science: IPANE

Invasive species exhibit these biological traits

• grow rapidly
• produce seeds early in the growing season
• produce massive amounts of seeds or propagate vegetatively
• produce chemicals that prohibit the growth of other plant species
• adapt to a wide range of environmental conditions

These characteristics result in the invasive plants overwhelming native ones to the detriment of native insects which are unable to use the non-natives as a food source. As is described in the article on page 1, native insects are vital for sustaining bird populations.

You can help identify locations with invasive plants as a volunteer for IPANE.

The Invasive Plant Atlas of New England is a multi-faceted project designed to provide comprehensive and up-to-date information about invasive plants in New England. The goals of the project are to facilitate education and research leading to a greater understanding of the dynamics of plant invasions, and to support the early detection of new invasions, which will enable rapid management responses.

The project includes a web-accessible atlas with images and descriptive information for the invasive and potentially invasive plants in New England. Collection databases constructed from herbarium specimens and current field records document the dates and locations of invasive plant occurrences, making it possible to generate maps that depict the distribution and spread of invasive plants across New England.

The intent is to provide public access to an online interactive resource that can act as an effective tool for students, researchers, land managers, conservationists, scientists, government agencies, the green industry, and the interested public.

The project is actively creating a network of trained volunteers who inventory habitats throughout New England for the presence and absence of invasive plant species. The data collected by our professionals and volunteers is used to continually update the collection databases, and plays a central role in IPANE’s goals of academic research and early detection.

Visit nbii-nin.ciesin.columbia.edu/ipane/ for complete details.

(From the March 2012 Newsletter)

Native Plants Support Native Insects; Native Insects Help Sustain Bird Populations

Most of us are aware that many birds are fond of the fruits and berries found on non-native plants as well as natives. 

One of the ways non-native plants spread and become invasive is through the guts of birds. Birds act as seed dispersers moving from one location to another taking invasive plants with them from your backyard to another backyard and often, into wild spaces.

Non-native plants ultimately cannot sustain bird populations because they do not support native insects. Native plants act as host plants and nectar sources for an insect’s entire life cycle, from larvae to adult. 

Native insects have evolved such that in their larval form they feed on a small number of plants and do not see non-native plants as food. For example, native plant expert Doug Tallamy writes that while the Kousa dogwood (Cornus kousa), a species from China, supports no insect herbivores in North America, our native flowering dogwood (Cornus florida) supports 117 species of moths and butterflies! Oaks are hosts to an astonishing 532 species of caterpillars. 

Blueberry plants, such as this lowbush blueberry (Vaccinium angustifolium - myrtilloides) support 288 species of Lepidoptera.

Photo: www.hort.uconn.edu/plants

Many invasive insects thrive here because birds do not recognize them as food. Perhaps you’ve heard of the gypsy moths that are destroying our hardwood forests or experienced hemlock woolly adelgid in your own backyard. Birds seek out indigenous insect species.

Spring azures are one type of Lepidoptera for which blueberry is a host. 

Photo: en.wikipedia.org/

Healthy insect populations are vital for birds during spring migration. During nesting season 96% of songbirds feed their young on insect protein.

During spring migration black-and-white warblers can be seen crawling up and down tree branches foraging for insects in bark crevices. Photo: education.eol.org

It starts with native plants. NATIVE plants + NATIVE insects = healthier bird populations.

Menunkatuck’s Native Plant Sale for the Birds offers trees and shrubs that will host native insects and feed birds. Please visit our website for ordering information. 

(From the March 2012 Newsletter)

A Plant Sale for the Birds

The excitement created by our recent project of planting native trees and shrubs at the Guilford Salt Meadows Sanctuary has not worn off. We’d like to share our experience with our members and the public, so next spring Menunkatuck Audubon will hold a plant sale.

And not just any plant sale. In an effort to discourage the continued planting and spread of invasive garden species, and to promote native plants that provide valuable food for birds, Menunkatuck will offer several native trees and shrubs that produce delicious fruits for some of our much loved birds.

Shadbush Serviceberry (Amelanchier canadensis) blooms in early spring with a profusion of small white flowers. This tree is adaptable to a wide variety of habitats, from wet swampy areas to dry uplands. Shadbush, or shadblow or Juneberry, grows from 10 to 20 feet tall and flowers best in full sun. It suckers quite freely. The hard red fruits ripen in June, providing an early summer feast for many species of birds, including scarlet tanager, rose-breasted grosbeak, American robin, hermit thrush, red-bellied woodpecker, hairy woodpecker, tufted titmouse, cedar waxwing, blue jay, and gray catbird. 

Red Chokeberry (Aronia arbutifolia) is a hardy shrub that grows to about 8 feet in height, and half that in width. It can tolerate both wet and dry soils.  Full sun produces the most fruit. Nice leaf color in the fall. It has small white flowers that produce clusters of bright red berries later in the summer that attract several birds, including wild turkey, black-capped chickadee, eastern meadowlark, and cedar waxwing. 

Silky Dogwood (Cornus amomum)  is a multi-stemmed tree with a rounded growth habit, growing to about 10 feet tall and wide. Umbels of creamy white flowers bloom in late spring, with deep blue clusters of fruits in the summer.  Likes moist soils and is a good plant to use on wet sites for mass border plantings. The fruits attract many birds, including wood duck, wild turkey, northern flicker, downy woodpecker, gray catbird, thrushes, northern mockingbird, and northern cardinal.  

Red Osier Dogwood (Cornus sericea) is a shrub dogwood with a multi-stem habit and grows to 10 feet or more.  Umbels of white flowers bloom in late spring. The late summer fruit are round white drupes that can be quite spectacular.  The stems turn a brilliant scarlet red in the winter, dramatic against snow cover. This dogwood likes moist soil and is an excellent plant to use for stream bank stabilization. Adaptable to other soil types as well. Birds attracted to the fruit include wild turkey, northern flicker, downy woodpecker, brown thrasher, eastern bluebird, purple finch, and white-throated sparrow. 

Winterberry (Ilex verticillata) ‘Jolly Red’ can grow 10 to 15 feet in height. Its tiny white flowers bloom in June; you’ll need at least one male plant to pollinate the female plants to produce berries. Unlike other hollies, the dark green leaves are deciduous and its bright red berries crowd its bare winter stems, making a spectacular show. Winterberry is a plant of wet areas, but will do reasonably well under dry conditions.  Acid soil is preferable, and full sun will produce the most berries. It is a favorite of many bird species including American robin, hermit thrush, eastern bluebird, yellow-bellied sapsucker, and white-throated sparrow. 

Trumpet Honeysuckle (Lonicera sempervirens)  is a twining vine with round to oval leaves.  The lovely, tubular flowers make quite a show in late spring to early summer and are a favorite of ruby-throated hummingbirds. Prefers well-drained neutral soil. Encourage vine to climb a trellis or other support. Two varieties available: ‘Alabama Crimson’ blooms are darker red than usual type; ‘Manifich’ is orange with a clear yellow throat.  

Lowbush Blueberry (Vaccinium angustifolium - myrtilloides) is a wonderful little groundcover that is not too fussy as to soil type.  Grows to about 18 inches tall, with shiny leaves. White urn-shaped flowers in early summer produce small blueberries in August. Birds known to enjoy the bonanza include wild turkey, scarlet tanager, American robin, eastern bluebird, northern flicker, gray catbird, blue jay, and orioles.

Highbush Blueberry (Vaccinium corymbosum) is a 6 to 8 foot shrub with glossy leaves that turn spectacular colors in the fall, including dark mahogany. Though it grows in dry, open fields, it is happiest in wet, boggy areas where soil is peaty and acidic. White urn-shaped flowers in early summer produce delicious berries in mid-summer that are loved by wild turkey, scarlet tanager, most thrush species, black-capped chickadee, tufted titmouse, gray catbird, blue jay, eastern towhee, and orioles. 

Possumhaw  Viburnum (Viburnum cassinoides/nudum), aka Witherod, grows about 8 to 10 feet in height and produces flat-topped clusters of small white flowers in early summer. Its fruits turn from green to pink with purple centers as summer progresses. Peaty damp soil is preferred; it can grow along the edge of ponds in very wet conditions. Also adaptable to drier soils.Wild turkey, brown thrasher, American robin, eastern bluebird, northern cardinal, pileated woodpecker, and cedar waxwing eat the fruits.

Cranberrybush Viburnum (Viburnum trilobum) ‘Wentworth’ grown in full sun can be quite spectacular when in bloom with its showy white 3 to 4 inch wide flower clusters.  This large shrub grows 8 to 10 feet in height with a spread of about the same.  It has three lobed, shiny leaves and likes moist soil with good drainage.  Bright red fruit clusters mature in September and can hang on the plant into the winter, providing food for wild turkey, various thrushes, cedar waxwing, and northern cardinal.  

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Though many of these plants grow in the understory in the wild, all will produce more flowers and fruit when grown in full sun.

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Watch for the native plant sale brochure in March.

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Images: Hermit thrush - beidlerforest.blogspot.com/, fruits -  www.hort.uconn.edu/plants/.