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Published In: Species Plantarum 1: 236. 1753. (1 May 1753) (Sp. Pl.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 8/4/2017)
Acceptance : Accepted
Project Data     (Last Modified On 7/9/2009)
Status: Introduced


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1. Bupleurum rotundifolium L. (thoroughwax, hare’s ear)

Pl. 204 i, j; Map 845

Plants annual, often somewhat glaucous. Stems 10–50 cm long, erect or ascending, glabrous. Leaves alternate and usually also basal (a few basal leaves usually present at flowering), glabrous, sessile or nearly so (in basal leaves), the sheathing bases absent or poorly developed, not inflated. Leaf blades 1.5–8.0 cm long, simple, ovate to elliptic-ovate in outline, rounded at the tip, the margins entire, the basal and lowermost stem leaves with the bases clasping the stems and with more or less rounded auricles, those of the median and upper leaves with the bases perfoliate. Inflorescences terminal and axillary, compound umbels, mostly long-stalked. Involucre absent. Rays 4–10, 0.5–1.5 cm long. Involucel of 5 bractlets, these fused at the base, 5–15 mm long, broadly ovate, tapered to sharp points at the tip. Flowers 10–12 in each umbellet, the stalks 1–3 mm long, giving the umbellets a dense, headlike appearance. Sepals absent. Petals broadly oblong to nearly circular, rounded at the tip, yellow to greenish yellow. Ovaries glabrous. Fruits 2.5–3.0 mm long, oblong-elliptic in outline, slightly flattened laterally, glabrous, purplish brown to black, each mericarp with 5 slender, inconspicuous ribs lacking wings. 2n=16. May–July.

Introduced, uncommon in eastern Missouri (native of Europe, Asia; introduced in the eastern U.S. west to South Dakota and Texas). Glades and dry upland forests; also roadsides, railroads, pastures, and open, disturbed areas.



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