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grass-leaf death-camas, meadow death-camas

foothill death camas, sand-corn

Habit Plants 2–7 dm, from bulbs; bulbs not clumped, tunicate, ovoid, 10–30 × 8–20 mm. Plants 2–7 dm, from bulbs; bulbs not clumped, tunicate, ovoid, 18–40 × 12–35 mm.
Leaves

proximal blades 12–50 cm × 2–10 mm.

proximal blades 15–35 cm × 3–15 mm.

Inflorescences

racemose or paniculate with 1 or 2 basal branches, 10–50-flowered, terminal raceme pyramidal in anthesis, 2–20 × 2–5 cm, branches (if any) 1/10–1/3 length of entire inflorescence, diverging from main axis at 10°–60° when in fruit.

paniculate, 10–80-flowered, narrow, terminal raceme pyramidal in anthesis, 2–30 × 2–4 cm, proximal branches usually less than 6 cm, 1/10–1/2 length of entire inflorescence, diverging from main axis at 10°–60° when in fruit.

Flowers

perianth hypogynous, campanulate, 5–10 mm diam.;

tepals persistent in fruit, cream colored, 2–5 × 1–3 mm, outer often clawed, apex usually acute;

gland 1, obovate, distal margins evident to obscure, irregular;

filaments straight, usually equaling tepals, occasionally longer, thickened proximally;

pedicel usually ascending in fruit, occasionally perpendicular to stem, 3–25 mm, bracts usually green, sometimes white, 5–25 mm.

perianth hypogynous, campanulate, 5–10 mm diam.;

tepals persistent in fruit, cream colored, ovate, 2–5 × 1–4 mm, outer usually not clawed, apex usually acute;

gland 1, obovate, distal margins evident to obscure, irregular;

filaments straight, usually equaling tepals, occasionally longer, thickened proximally;

pedicel ascending to perpendicular to stem in fruit, 3–25 mm, bracts green, lanceolate, 5–15 mm.

Capsules

8–20 × 4–7 mm.

5–20 × 3–8 mm.

2n

= 22.

= 22.

Zigadenus venenosus

Zigadenus paniculatus

Phenology Flowering Apr–Jun.
Habitat Sagebrush desert, dry open inland grasslands
Elevation 1300–2600 m (4300–8500 ft)
Distribution
from USDA
w North America
[WildflowerSearch map]
from FNA
AZ; CA; CO; ID; MT; NM; NV; OR; UT; WA; WY
[WildflowerSearch map]
Discussion

Varieties 2 (2 in the flora).

Zigadenus venenosus is a smaller, more slender plant than either Z. paniculatus or Z. fontanus. It can be distinguished from Z. micranthus by its ascending pedicels. It has a much broader distribution than either Z. micranthus or Z. fontanus, and does not occur on serpentine substrates.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Key
1. Outer tepals usually clawed ca. 5 mm; inflorescences mostly racemose, occasionally paniculate with 1 basal branch.
var. venenosus
1. Outer tepals not clawed, or clawed less than 5 mm; inflorescences mostly paniculate with 1–2 basal branches, occasionally racemose.
var. gramineus
Source FNA vol. 26, p. 84. FNA vol. 26, p. 85.
Parent taxa Liliaceae > Zigadenus Liliaceae > Zigadenus
Sibling taxa
Z. brevibracteatus, Z. densus, Z. elegans, Z. exaltatus, Z. fontanus, Z. fremontii, Z. glaberrimus, Z. micranthus, Z. mogollonensis, Z. nuttallii, Z. paniculatus, Z. vaginatus, Z. virescens
Z. brevibracteatus, Z. densus, Z. elegans, Z. exaltatus, Z. fontanus, Z. fremontii, Z. glaberrimus, Z. micranthus, Z. mogollonensis, Z. nuttallii, Z. vaginatus, Z. venenosus, Z. virescens
Subordinate taxa
Z. venenosus var. gramineus, Z. venenosus var. venenosus
Synonyms Toxicoscordion venenosum Helonias paniculata, Toxicoscordion paniculatum
Name authority S. Watson: Proc. Amer. Acad. Arts 14: 279. (1879) (Nuttall) S. Watson: Botany (Fortieth Parallel), 343. (1871)
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