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grass-leaf death-camas, meadow death-camas

small-flower death camas

Habit Plants 2–7 dm, from bulbs; bulbs not clumped, tunicate, ovoid, 10–30 × 8–20 mm. Plants 3–9 dm, from bulbs; bulbs not clumped, tunicate, ovoid, 12–40 × 12–40 mm.
Leaves

proximal blades 12–50 cm × 2–10 mm.

proximal blades 18–80 cm × 3–20 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.

usually paniculate, 10–100-flowered, with 1–15 branches, narrow, appearing pyramidal in early anthesis, terminal raceme 5–60 × 3–7 cm, proximal branches 1/3–1/2 length of entire inflorescence, extending upwards from main axis of inflorescence at 10°–60° angle.

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, 5–15 mm diam.;

tepals persistent in fruit, cream colored, 4–12 × 1–4 mm, outer usually lacking claw;

gland 1, obovate, distal margins evident, serrate to dentate;

filaments straight, shorter than tepals, thickened proximally;

pedicel horizontally spreading, usually perpendicular to stem in fruit, 15–45 mm, bracts green, 5–35 mm.

Capsules

8–20 × 4–7 mm.

narrowly conic, 9–22 × 3–6 mm.

2n

= 22.

= 22.

Zigadenus venenosus

Zigadenus fontanus

Phenology Flowering late Mar–Aug.
Habitat Serpentine marshes
Elevation 0–500 m (0–1600 ft)
Distribution
from USDA
w North America
[WildflowerSearch map]
from FNA
CA
[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.
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. fremontii, Z. glaberrimus, Z. micranthus, Z. mogollonensis, Z. nuttallii, Z. paniculatus, Z. vaginatus, Z. venenosus, Z. virescens
Subordinate taxa
Z. venenosus var. gramineus, Z. venenosus var. venenosus
Synonyms Toxicoscordion venenosum Z. micranthus var. fontanus
Name authority S. Watson: Proc. Amer. Acad. Arts 14: 279. (1879) Eastwood: Leafl. W. Bot. 2: 41. (1937)
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