Flora of North America species comparison

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Corispermum americanum

American bug-seed, common bug-seed
Habit Plants branched from or beyond base (rarely simple or with few simple branches), 10–35(–50) cm, sparsely covered with dendroid or stellate hairs, often becoming glabrous.
Leaf

blades linear or narrowly linear (occasionally linear-lanceolate or almost filiform), usually plane or occasionally folded (especially in dry plants), 1.5–3.5(–4) × 0.1–0.3 cm.
Bracts

ovate-lanceolate,lanceolate, linear-lanceolate, or occasionally proximal ones almost linear, much longer than distal, 0.5–2(–3.5) × (0.2–)0.3–0.7 cm.
Inflorescences

usually lax, interrupted, rarely ± condensed distally, linear, narrowly linear, or occasionally narrowly clavate.
Perianth

segment 1.
Fruits

yellowish brown, greenish brown, light brown, or brown, often with reddish brown spots and whitish warts, slightly convex abaxially, usually plane or slightly concave adaxially, obovate or obovate-elliptic, usually broadest beyond middle, (2.3–)2.5–4.5 × 2–3.5 mm, shiny or dull;

wing translucent, thin, (occasionally translucent only at margin, thick), (0.15–)0.2–0.3(–0.4) mm wide, margins entire or rarely indistinctly erose, apex broadly triangular, less commonly truncate or rounded.

Corispermum americanum
Distribution
from FNA
AR; AZ; CA; CO; ID; IL; IN; KS; MN; MO; MT; ND; NE; NJ; NM; NV; NY; OH; OK; OR; SD; TX; UT; WA; WI; WY; AB; BC; MB; ON; QC; SK; Mexico
[WildflowerSearch map]
[BONAP county map]
Discussion

Varieties 2 (2 in the flora).

Corispermum americanum var. americanum may also occur in British Columbia, where only immature specimens have been seen. Specimens from Oregon and Wyoming are transitional toward Corispermum villosum. The names C. hyssopifolium and C. nitidum were commonly misapplied to this native species by many authors (see also note under C. nitidum).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Fruits (2.3-)2.5-3.5 mm, wing usually 0.2-0.3 mm wide (occasionally fruits almost wingless in some southwestern plants)
var. ameri
1. Fruits (3-)3.5-4(-4.5) mm, wing usually 0.3-0.4(-0.5) mm wide.
var. rydbe
Source FNA vol. 4.
Parent taxa Chenopodiaceae > Corispermum
Sibling taxa
C. hookeri, C. hyssopifolium, C. navicula, C. nitidum, C. ochotense, C. pacificum, C. pallasii, C. pallidum, C. villosum, C. welshii
Subordinate taxa
C. americanum var. ameri, C. americanum var. rydbe
Synonyms C. hyssopifolium var. americanum, C. imbricatum, C. marginale, C. simplicissimum
Name authority (Nuttall) Nuttall: Trans. Amer. Philos. Soc., n. s. 5: 165. (1834)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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