Cyperus parishii |
Cyperus elegans |
|
---|---|---|
Parish flatsedge, Parish's flatsedge, Parish's nutgrass |
royal flatsedge, sticky flatsedge |
|
Habit | Herbs, annual, cespitose. | Herbs, perennial, cespitose, shortly rhizomatous, coarse, viscous. |
Culms | trigonous, 5–25 cm × 1–1.5 mm, glabrous. |
round to roundly trigonous, 15–80 cm × 2–4 mm, glabrous. |
Leaves | adaxial face concave, becoming trigonous apically, 15–75 cm × 1–4 mm, margins involute. |
|
Inflorescences | spikes loosely ovoid, 15–25 mm wide; rays 1–6, 2–7 cm; bracts 2–5, 3–20 cm, ascending; rachilla deciduous, winged. |
spikes ovoid, 10–20 mm wide; rays 3–8(–10), 0.5–12 cm; 2d order rays 0–3, 1–3 cm; bracts 3–7, horizontal to vertical, 2.5–5.5 cm × 1–4 mm, margins involute; 2d order bracts 0–3, 1–3 cm; rachilla persistent, wingless. |
Spikelets | 5–30, linear, flattened, 6–22 × 1.5–2.2 mm; floral scales ± deciduous, (4–)8–12, red, reddish purple, or reddish brown, medially green, elliptic, laterally 2–4-ribbed, 2.3–3.1 × 1.2–2 mm, apex acute to obtuse. |
3–20(–30), beige to greenish or reddish brown, strongly compressed, oblong-ellipsoid to oblong-lanceoloid, 3–15 × 2.5–3.5 mm; floral scales deciduous, 6–22, laterally pale greenish white to stramineous or reddish brown, medially pale green to yellowish green, laterally 2-ribbed, medially 3–5-ribbed, broadly ovate, (2–)2.8–3.6 × 2.4–2.6 mm, apex with slightly excurved mucro 0.2–0.3 mm, apically scabrid. |
Flowers | anthers 0.3–0.4 mm; styles 1 mm; stigmas 1.3–1.6 mm. |
anthers 0.6–1.4 mm; styles 1.2–1.5 mm; stigmas 1–1.5(–3) mm. |
Achenes | brown to dark purplish brown, broadly ellipsoid, 1–1.3 × 0.6–0.9 mm, surfaces puncticulate. |
dark reddish brown to black, stipitate, obovoid, faces concave, flat or subtly convex, (1.4–)1.8–2 × 0.9–1 mm, base cuneate, stipe (sometimes absent) spongy, 0.1–0.2 × 0.2–0.4 mm, apex truncate, apiculate, surfaces coarsely papillose. |
Cyperus parishii |
Cyperus elegans |
|
Phenology | Fruiting summer. | Fruiting summer. |
Habitat | Stream banks, desert washes, arroyos, roadsides | Ditches, damp pastures, pond shores, riverbanks |
Elevation | 0 800 m (0 2600 ft) | 0–500 m (0–1600 ft) |
Distribution |
AZ; CA; NM
|
FL; LA; NM; TX; Mexico; Central America; South America
|
Source | FNA vol. 23, p. 170. | FNA vol. 23, p. 172. |
Parent taxa | Cyperaceae > Cyperus > subg. Cyperus | Cyperaceae > Cyperus > subg. Cyperus |
Sibling taxa | ||
Synonyms | C. congestus var. parishii | C. trachynotus |
Name authority | Britton ex Parish: Bull. S. Calif. Acad. Sci. 3: 52, plate 3. (1904) | Linnaeus: Sp. Pl. 1: 45. (1753) |
Web links |