Zigadenus venenosus var. gramineus

(Rydberg) O. S. Walsh ex C. L. Hitchcock

in C. L. Hitchcock et al., Vasc. Pl. Pacif. N.W. 1: 815. 1969.

Common names: Grassy death camas
Endemic
Basionym: Zigadenus gramineus Rydberg Bull. Torrey Bot. Club 27: 535. 1900 (as Zygadenus)
Synonyms: Toxicoscordion acutum (Rydberg) Rydberg Toxicoscordion falcatum (Rydberg) Rydberg Toxicoscordion gramineum (Rydberg) Rydberg Toxicoscordion intermedium (Rydberg) Rydberg Zigadenus acutus Rydberg Zigadenus falcatus Rydberg Zigadenus intermedius Rydberg
Treatment appears in FNA Volume 26. Treatment on page 84.

Inflorescences mostly paniculate with 1–2 basal branches, occasionally racemose, 2–15 × 2–5 cm. Flowers: outer tepals not clawed, or clawed less than 5 mm. Capsules 9–20 × 4–7 mm.


Phenology: Flowering Apr–Jul.
Habitat: Inland grasslands, open pine woods
Elevation: 500–1300 m

Distribution

V26 78-distribution-map.jpg

Alta., B.C., Sask., Colo., Idaho, Mont., Nebr., N.Dak., Oreg., S.Dak., Wash., Wyo.

Discussion

Variety gramineus is most easily distinguished from var. venenosus by its paniculate inflorescence, although some individuals in each population are racemose. It occurs well inland, east of the Cascade and Rocky mountains and at high elevations within those ranges.

Selected References

None.

Lower Taxa

None.
Fayla C. Schwartz +
(Rydberg) O. S. Walsh ex C. L. Hitchcock +
Zigadenus gramineus +
Grassy death camas +
Alta. +, B.C. +, Sask. +, Colo. +, Idaho +, Mont. +, Nebr. +, N.Dak. +, Oreg. +, S.Dak. +, Wash. +  and Wyo. +
500–1300 m +
Inland grasslands, open pine woods +
Flowering Apr–Jul. +
in C. L. Hitchcock et al., Vasc. Pl. Pacif. N.W. +
W2 +, W1 +  and Endemic +
Toxicoscordion acutum +, Toxicoscordion falcatum +, Toxicoscordion gramineum +, Toxicoscordion intermedium +, Zigadenus acutus +, Zigadenus falcatus +  and Zigadenus intermedius +
Zigadenus venenosus var. gramineus +
Zigadenus venenosus +
variety +