Corispermum hyssopifolium
Corispermum welshii
bugseed, hyssop-leaf bugseed
Welsh's bugseed
blades linear-lanceolate or linear; usually plane,1.5–3.5(–4) × 0.2–0.4(–0.5) cm.
blades linear-lanceolate or linear, usually plane (or rarely slightly convolute or folded in dried plants), 1–6 × 0.2–0.5 cm.
ovate or ovate-lanceolate (rarely narrowly ovate-lanceolate to ± lanceolate), 0.5–1.5(–2) × 0.3–0.7 cm.
ovate or ovate-lanceolate (rarely narrowly ovate-lanceolate), 1–3 × 0.3–0.8 cm.
compact, usually not strongly condensed at apex, occasionally interrupted near base, linear, oblong-linear, or indistinctly clavate-linear.
usually compact and dense, rarely ± lax, and condensed only at apex, ovoid, oblong-obovate, or oblong-clavate.
segments 1(–3).
segment 1.
brown, dark brown, or deep olive green, usually without spots and warts, broadly elliptic, prominently convex abaxially, usually plane or slightly concave adaxially, obovate-elliptic, or ± orbiculate, broadest near middle (rarely slightly beyond middle), 2.2–3.2 (–3.5) × 1.7–2.8 mm shiny wing (when present) translucent at margins, 0.1(–0.15) mm wide, margins entire, apex 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.
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 hyssopifolium
Corispermum welshii
In addition to the key characteristics, Corispermum hyssopifolium is distinguished by having style bases short, barely exposed over the edge of wing and fruit surfaces which are glabrous and shiny.
The application of the Linnaean name Corispermum hyssopifolium is problematic. The standing lectotype (C. E. Jarvis et al. 1993; I. C. Hedge 1997) and traditional circumscription of C. hyssopifolium (as understood by M. M. Iljin 1936; P. Aellen 1961, 1964; and many others) are accepted here.
No unquestionable specimens of Corispermum hyssopifolium sensu stricto are known from North America. A collection from Colorado and some collections from Missouri approach this species most closely (S. L. Mosyakin 1995). However, their fruit morphology suggests that they are either members of the native Asian and North American group centered around C. pallasii, or resulted from hybridization between C. hyssopifolium and native representatives of subsect. Pallasiana.
The name Corispermum hyssopifolium has been misapplied to the majority of species of the genus.
(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.)
CA
WildflowerSearch
iNaturalist
USDA Plants Database
