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Published In: Plantae Wilsonianae an enumeration of the woody plants collected in Western China for the Arnold Arboretum of Harvard University during the years 1907, 1908 and 1910 by E.H. Wilson edited by Charles Sprague Sargent ... 1(3): 456. 1913. (Pl. Wilson.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 9/22/2017)
Acceptance : Accepted
Project Data     (Last Modified On 7/9/2009)
Status: Introduced


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1. Exochorda racemosa (Lindl.) Rehder (common pearlbush)

Map 2443

Plants shrubs, 1–3 m tall, with several slender trunks. Branches sometimes developing lateral short shoots, but unarmed. Bark orangish brown, brown, and gray, peeling in variously colored plates on older trunks, usually reddish brown to dark gray and with scattered small lenticels on branches. Twigs tan to reddish brown, becoming dark gray, angled, glabrous. Winter buds lateral and terminal, narrowly ovoid to narrowly conic, bluntly to occasionally sharply pointed at the tip, with several overlapping scales, glabrous. Leaves alternate, occasionally appearing more or less whorled at the tips of short branches, rolled lengthwise during development, sessile or more commonly short-petiolate, the petioles glabrous. Stipules absent. Leaf blades simple, unlobed, elliptic to oblong-elliptic, oblong-obovate or narrowly obovate, rounded or bluntly and broadly pointed at the tip, often with a minute, sharply pointed extension of the midvein at the very tip, tapered at the base, the margins entire or shallowly wavy, scalloped, or toothed toward the tip, the teeth not gland-tipped, the surfaces glabrous, the undersurface pale, the venation pinnate. Inflorescences terminal, racemes of 4–10 flowers, these produced after the leaves develop, the axis and stalks glabrous at maturity, sometimes sparsely hairy when young, the flower stalks 3–12 mm long, each with a small bract at the base, the lowest of these leaflike, grading upward to small, narrowly oblong-elliptic, and scalelike, mostly persistent, each flower also with a pair of small bractlets near the tip of the stalk, these linear to narrowly oblong, white, shed early. Flowers perfect or usually functionally staminate or pistillate (mixed in the same inflorescence), shallowly perigynous, not fragrant, the hypanthium not fused to the ovary above its base, saucer-shaped to shallowly bell-shaped, persistent as a small disc, glabrous. Sepals 5, 2–3 mm long, loosely ascending to spreading at flowering, triangular, mostly sharply pointed at the tip, the margins entire, the surfaces glabrous, shed after flowering. Petals 5, 12–20 mm long, obovate to nearly circular, short-tapered to a short, stalklike base, white. Stamens 15–20, exserted, the filaments attached on the disc, the anthers yellow. Pistil 1 per flower, of 5 loosely fused carpels. Ovary superior, with 5 locules containing 2 ovules (1 of these usually abortive). Styles 5, erect and appressed but not fused, the stigmas small, capitate. Fruits capsules, 6–10 mm long, broadly obovate to broadly oblong or depressed-circular in outline, deeply 5-lobed, the lobes appearing more or less flattened and semicircular in outline, glabrous, brown to gray at maturity, dehiscing from the tip, persistent after the seeds are shed, the lobes sometimes breaking apart (the joined surfaces usually pale and appearing densely short-hairy), with usually 1 seed per locule, this 5–9 mm long, irregularly oval to oblong-elliptic or semicircular, strongly flattened, with a complete or incomplete wing around the margin, the surface brown to dark brown, glabrous, smooth. 2n=16, 18. April–May.

Introduced, uncommon, known thus far only from Franklin County (native of Asia, introduced sporadically in the eastern U.S. west to Missouri and Louisiana). Disturbed mesic upland forests.

This species was first collected in 2006 by Nels Holmberg at the Shaw Nature Reserve, where plants escaped from an old planting into an adjacent forest.



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