Cyperus esculentus var. heermannii

(Buckley) Britton

Bull. Torrey Bot. Club 13: 211. 1886.

Basionym: Cyperus heermannii Buckley Proc. Acad. Nat. Sci. Philadelphia 1862: 10. 1862
Treatment appears in FNA Volume 23. Treatment on page 169. Mentioned on page 168.

Spikelets ascending-erect, forming less than 40° angle with rachis, closely spaced (2 or more per mm of rachis), 15–25(–55) mm; floral scales deltate-ovate, widest at 1/4–1/3 length, 2.4–2.6 × 1.7–1.8 mm. Flowers: anthers 1.2 mm; styles 0.9 mm; stigmas 1.6 mm.


Phenology: Fruiting summer.
Habitat: Disturbed soils, croplands
Elevation: 0–1200 m

Distribution

V23 276-distribution-map.jpg

Calif., Fla., Utah, Mexico.

Discussion

Cyperus esculentus var. heermannii is the least common and most geographically restricted of the varieties. Its spikes are more dense (2 or more spikelets per mm of rachis) than the other varieties (ca. 1 spikelet per mm of rachis).

Selected References

None.

Lower Taxa

None.
Gordon C. Tucker* +, Brian G. Marcks* +  and J. Richard Carter * +
(Buckley) Britton +
Cyperus heermannii +
Calif. +, Fla. +, Utah +  and Mexico. +
0–1200 m +
Disturbed soils, croplands +
Fruiting summer. +
Bull. Torrey Bot. Club +
W2 +, W1 +  and Illustrated +
Undefined subg. Chlorocyperus +, Cyperus subg. Mariscus +  and Undefined subg. Papyrus +
Cyperus esculentus var. heermannii +
Cyperus esculentus +
variety +