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American bug-seed, common bug-seed

Welsh's bugseed

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.

blades linear-lanceolate or linear, usually plane (or rarely slightly convolute or folded in dried plants), 1–6 × 0.2–0.5 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.

ovate or ovate-lanceolate (rarely narrowly ovate-lanceolate), 1–3 × 0.3–0.8 cm.

Inflorescences

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

usually compact and dense, rarely ± lax, and condensed only at apex, ovoid, oblong-obovate, or oblong-clavate.

Perianth

segment 1.

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.

yellowish brown, light brown, or brown, usually with reddish brown spots and whitish warts, strongly to slightly convex abaxially, usually concave adaxially, obovate or orbiculate-obovate, usually broadest slightly beyond middle (occasionally almost near middle), (3.3–)3.7–4.6 × (2.7–)3–3.6 mm, slightly shiny or dull;

wing translucent, thin, (rarely translucent only at margin, thicker), (0.3–)0.4–0.6 mm wide, margins entire or irregularly minutely erose-denticulate, apex rounded, truncate, or indistinctly emarginate.

Plant

branched from base or nearly so, 10–35 cm, densely or sparsely covered with dendroid or stellate hairs (rarely with scattered papillae at margins of bracts).

Corispermum americanum

Corispermum welshii

Phenology Flowering late summer–fall.
Habitat Sand dunes, sandy shores of creeks and rivers, dry valleys
Elevation 1300-2200 m (4300-7200 ft)
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]
from FNA
AZ; NM; UT; WY
[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.)

The names Corispermum hyssopifolium and C. villosum have been misapplied to C. welshii. Judging from its fruit morphology, C. welshii is closely related to C. americanum, especially to var. rydbergii. Forms intermediate between these taxa occasionally occur, especially in Utah. However, C. welshii differs from C. americanum in having shorter and thicker inflorescences and broader leaves and bracts. Forms similar to C. welshii occur also in other southwestern states, particularly in Colorado and western Texas. These plants are in need of additional study.

(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. FNA vol. 4, p. 317.
Parent taxa Chenopodiaceae > Corispermum Chenopodiaceae > Corispermum
Sibling taxa
C. hookeri, C. hyssopifolium, C. navicula, C. nitidum, C. ochotense, C. pacificum, C. pallasii, C. pallidum, C. villosum, C. welshii
C. americanum, C. hookeri, C. hyssopifolium, C. navicula, C. nitidum, C. ochotense, C. pacificum, C. pallasii, C. pallidum, C. villosum
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) Mosyakin: Novon 5: 348, fig. 1E. (1995)
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