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Published In: Synopsis der Deutschen und Schweizer Flora 3(16): 2531. 1905. (Syn. Deut. Schweiz. Fl. (ed. 3)) Name publication detailView in Biodiversity Heritage Library

Project Name Data (Last Modified On 9/1/2009)
Acceptance : Accepted

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1. Bolboschoenus (Asch.) Palla

Plants perennial, with stout, hard rhizomes usually thickened and tuberous at the nodes. Aerial stems few to many per plant, erect to ascending, unbranched, strongly triangular in cross-section, glabrous. Leaves basal and alternate along the stems, the sheath apices convex to concave, the ligule absent, the leaf blades spreading to ascending, flat, glabrous, the margins finely and sharply toothed. Inflorescences terminal, subtended by (1)2–6 leaflike bracts, composed of few to numerous spikelets, these 10–40 mm long, 6–12 mm in diameter, stalked and/or sessile in irregular umbels or headlike clusters, the scales short-hairy. Florets usually many per spikelet, several-ranked in an overlapping spiral pattern, perfect. Perianth bristles 2–6 or less commonly absent. Stamens 3. Styles not expanded at the base during flowering, not forming a tubercle, but frequently persisting on the fruit as a short beak. Stigmas 2–3. Ovaries and fruits naked, without a perigynium (saclike covering). Fruits 2.5–5.0 mm long, 3-angled, somewhat flattened (unequally biconvex), or nearly circular in cross-section. About 12 species, North America to South America, Europe, Asia, Australia.

Bolboschoenus has been included in the genus Scirpus in most of the North American botanical literature. For further discussions of the segregation of genera from Scirpus, see the treatment of that genus and the review of Missouri bulrushes by Smith and Yatskievych (1997).


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1 Stigmas 3; leaf sheath apices convex, the veins bent abruptly to the sides just below the sheath tip 1 Bolboschoenus fluviatilis
+ Stigmas 2; leaf sheath apices truncate or concave, the veins arched gradually to the sides below the sheath tip 2 Bolboschoenus maritimus
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