Difference between revisions of "Cyperus sanguinolentus"

Vahl

Enum. Pl. 2: 351. 1805.

Synonyms: Cyperus louisianensis Thieret Pycreus sanguinolentus (Vahl) Nees
Treatment appears in FNA Volume 23. Treatment on page 161. Mentioned on page 142, 162.
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|subgenus=Cyperus subg. Pycreus
 
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Revision as of 19:07, 24 September 2019

Herbs, perennial; rhizomes ± horizontal, to 12 cm × 0.8–1.2 mm. Culms ± terete to roundly trigonous, 3–25(–60) cm × 0.3–2 mm, glabrous. Leaves 1–3, V-shaped, 1–8(–15) cm × 1–2 mm. Inflorescences: spike 1, loosely ovoid, 7–14 × 8–20 mm; rays (0–)1–4, to 2(–3) cm; bracts 2–4, horizontal to ascending at 30(–45)°, V-shaped to flat, 1–8(–18) cm × 0.5–1.5(–2) mm. Spikelets 3–5(–14), oblong to linear-lanceoloid, 8–18 × 2–2.6(–3) mm; floral scales (6–)10–26(–32), laterally clear to light brown, sometimes with purplish margins, medially light brown, 2-keeled, laterally ribless, medially 2–3-ribbed, oblong to ovate, 1.9–2.2(–2.7) × 1.8–2.3 mm, apex obtuse. Flowers: stamens 3; anthers ellipsoid, 0.3–0.6 mm, connective not prolonged; styles 0.6–1 mm; stigmas 1–1.5 mm. Achenes brown, ± stipitate, obovoid to ovoid, 1–1.4 × 0.6–0.8 mm, apex truncate, apiculate, surfaces minutely punctate.


Phenology: Fruiting late summer–fall.
Habitat: Emergent shorelines, ditches
Elevation: 20 m

Distribution

V23 257-distribution-map.jpg

Ala., Ga., La., Miss., Asia, Africa.

Discussion

Cyperus sanguinolentus is the only rhizomatous, distigmatic Cyperus in the eastern United States. An early collection from Louisiana was described as C. louisianensis, supposedly endemic. Recent field work and morphometric studies convincingly showed it to be an introduction of the Asian C. sanguinolentus) (J. R. Carter and C. T. Bryson 2001.

Lower Taxa

None.
... more about "Cyperus sanguinolentus"
Gordon C. Tucker* +, Brian G. Marcks* +  and J. Richard Carter * +
Undefined subg. Pycreus +
Ala. +, Ga. +, La. +, Miss. +, Asia +  and Africa. +
Emergent shorelines, ditches +
Fruiting late summer–fall. +
carter2001a +
Cyperus louisianensis +  and Pycreus sanguinolentus +
Cyperus sanguinolentus +
Cyperus subg. Pycreus +
species +