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(Last Modified On 10/23/2012)
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(Last Modified On 10/23/2012)
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Species
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CYPERUS NIGER Ruiz & Pavon
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PlaceOfPublication
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Fl. Peruv. 1:47. 1798
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Synonym
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Cyperus melanostachyus HBK. Nov. Gen. & Sp. 1:207. 1816. Cyperus diandrus var. castaneus S. Wats. Bot. Calif. 2:214. 1880. Cyperus diandrus var. capitatus Britton, Bull. Torrey Club 13:205. 1886. Pycreus me!anostachyus C. B. Clarke, Contrib. U., S. Nat. Herb. 10:446. 1908.
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Description
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Plants usually rhizomatous, frequently with interlacing culms; culms slender, erect, 10-30 cm. high; leaves sparse, 0.5-2 mm. wide, equaling or shorter than the culms; bracts long and leaf-like; inflorescence capitate, less frequently with 1-3 short rays; spikelets compressed, 4-10 mm. long, 2 mm. wide, black or more frequently castaneous; scales 1.5-2 mm. long, usually closely appressed; achene biconvex, unsymmetrically ellipsoid, 1-1.5 mm. long, deep brown and densely papillose when mature.
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Distribution
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Texas and New Mexico, southward in the mountains to Bolivia and Argentina.
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Note
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In Panama in boggy places
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Elevation
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1200-2000 m.
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Specimen
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CHIRIQUI: "New Switzerland," alt. 1800-2000 m., Allen I376. CYPERUS NIGER var. CASTANEUS (S. Watson) Kuekenthal, from lower levels, is much more abundant. Here seem to belong the plants named C. lmceolatus (C. Olfersianus, C. Humboidtianus) in various collections, insofar as I have seen them, nor does Kuekenthal (p. 349) cite C. lanceolatus from Panama, a species closely related to C. Aschenbornianus in its reddish, somewhat glaucous achenes. CHIRIQUI: Boquete, alt. 1200-1500i m., Woodson d Scbery 748; Finca Lerida to Boquete, ca. 1300-1700 m., Woodson, Allen d Seibert II57, II34; El Boquete, Killip 4534; Cornman 2690. cocLt: between Las Margaritas and El Valle, Woodson, Allen d Seibert I723. PANAMA: between Pacora and Chepo, Woodson, Allen d Seibert I638 (probably C. niger var. castaneus, but too young).
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