Zigadenus vaginatus |
Zigadenus nuttallii |
|
---|---|---|
sheath death camas |
Nuttall's death camas |
|
Habit | Plants 4–6 dm, from bulbs; bulbs not clumped, tunicate, narrowly ovoid, 3–6 × 1.5–3 cm. | Plants 3–7.5 dm, from bulbs; bulbs not clumped, tunicate, ovoid, 15–40 × 9–35 mm. |
Stems | with persistent leaf bases proximally. |
|
Leaves | proximal blades 25–40 cm × 5–12 mm. |
proximal blades 15–45 cm × 3–15 mm. |
Inflorescences | paniculate, 15–30-flowered, with 1–4 branches, 1.5–3 dm × 3–6 cm, proximal branches 7–8 cm. |
usually paniculate, 20–60-flowered, with 1–8 branches, narrow, terminal raceme pyramidal in early anthesis, 3–30 × 3–7 cm, proximal branches 1/10–1/2 length of entire inflorescence, ascending at 10°–60° angle. |
Flowers | perianth perigynous, rotate to rotate-campanulate, 10–15 mm diam.; tepals white, ovate, 3–6 × 3–4 mm, somewhat narrowed at base, apex broadly rounded; gland 1, obcordate, thick; pedicel ascending at anthesis, 1–1.5 cm, bracts often streaked with purple, ovate, 3–6 mm. |
perianth hypogynous, campanulate, 10–15 mm diam.; tepals persistent in fruit, cream colored, ovate, 3–8 × 1–4 mm, outer unclawed or rarely clawed to 5 mm, apex usually obtuse; gland 1, obovate, distal margins obscure, thin; filaments straight, usually equaling tepals, occasionally longer, thickened proximally; pedicel usually ascending in fruit, occasionally perpendicular to stem, 10–35 mm, bracts green, somewhat falcate, 3–20 mm. |
Capsules | narrowly conic, 7–8 mm. |
8–16 × 3–8 mm. |
2n | = 32. |
= 32. |
Zigadenus vaginatus |
Zigadenus nuttallii |
|
Phenology | Flowering Aug. | Flowering Mar–Jun. |
Habitat | Wet sandstone ledges of canyons, “hanging garden” community | Tallgrass prairie, calcareous glades, rocky hillsides |
Elevation | 1100–1900 m (3600–6200 ft) | 500–1200 m (1600–3900 ft) |
Distribution |
CO; UT
|
AR; KS; MO; OK; TX
|
Discussion | Of conservation concern. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 26, p. 87. | FNA vol. 26, p. 86. |
Parent taxa | Liliaceae > Zigadenus | Liliaceae > Zigadenus |
Sibling taxa | ||
Synonyms | Anticlea vaginata | Amianthium nuttallii, Toxicoscordion nuttallii, Toxicoscordion texense, Z. texensis |
Name authority | (Rydberg) J. F. Macbride: Contr. Gray Herb. 53: 4. (1918) | (A. Gray) S. Watson: Botany (Fortieth Parallel), 343. (1871) |
Web links |