Corispermum welshii
Corispermum hookeri
Welsh's bugseed
Hooker bugseed, Hooker's bugseed
blades linear-lanceolate or linear, usually plane (or rarely slightly convolute or folded in dried plants), 1–6 × 0.2–0.5 cm.
blades narrowly lanceolate or linear-lanceolate, plane, 2–5 × (0.1–)0.2–0.5(–0.6) cm.
ovate or ovate-lanceolate (rarely narrowly ovate-lanceolate), 1–3 × 0.3–0.8 cm.
ovate or ovate-lanceolate, 0.5–1.5(–2) × 0.3–1 cm.
usually compact and dense, rarely ± lax, and condensed only at apex, ovoid, oblong-obovate, or oblong-clavate.
usually dense, ovoid, ovate-clavate, or ovate-cylindric, rarely interrupted near base.
segment 1.
segment 1.
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.
usually deep olive green, brown, or rarely to almost black, usually without spots and/or warts, or occasionally spotted, strongly convex abaxially, prominently concave to almost plane adaxially, usually broadest beyond middle, (3.2–)3.5–4.5(–5) × 2.2–3.3(–3.5) mm;
wing (when present) semitranslucent, to 0.2 mm wide, margins entire, apex rounded or indistinctly triangular.
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 welshii
Corispermum hookeri
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.)
Varieties 2 (2 in the flora).
The inflorescence bracts of Corispermum hookeri are conspicuously imbricate (usually strongly overlapping). Corispermum hookeri seems to be closely related to the narrow-winged taxa, C. villosum and C. ochotense, and to C. pallasii sensu stricto. The names C. orientale and C. hyssopifolium have been commonly misapplied to this species.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Inflorescences dense throughout, rarely interrupted. Fruits oblong-obovate to obovate | var. hookeri |
1. Inflorescences dense only at apex, interrupted. Fruits elongate to oblong-obovate | var. pseudodeclinatu |
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