Corispermum americanum |
Corispermum welshii |
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American bug-seed, common bug-seed |
Welsh's bugseed |
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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. |
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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. |
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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. |
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Perianth | segment 1. |
segment 1. |
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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. |
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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). |
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Corispermum americanum |
Corispermum welshii |
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Phenology | Flowering late summer–fall. | |||||
Habitat | Sand dunes, sandy shores of creeks and rivers, dry valleys | |||||
Elevation | 1300-2200 m (4300-7200 ft) | |||||
Distribution |
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
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AZ; NM; UT; WY |
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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.) |
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Key |
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Source | FNA vol. 4. | FNA vol. 4, p. 317. | ||||
Parent taxa | Chenopodiaceae > Corispermum | Chenopodiaceae > Corispermum | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
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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