Corispermum navicula
Corispermum hookeri
boat-shape bugseed, crescent bugseed
Hooker bugseed, Hooker's bugseed
blades linear-lanceolate, linear, occasionally narrowly lanceolate, usually plane, (1.5–)2–4 × 0.1–0.5 cm.
blades narrowly lanceolate or linear-lanceolate, plane, 2–5 × (0.1–)0.2–0.5(–0.6) cm.
ovate or ovate-lanceolate (occasionally proximal ones leaflike, narrowly ovate-lanceolate or lanceolate), 0.5–2 × 0.2–0.6 cm.
ovate or ovate-lanceolate, 0.5–1.5(–2) × 0.3–1 cm.
compact and dense, ovoid, ovate or oblong-obovate.
usually dense, ovoid, ovate-clavate, or ovate-cylindric, rarely interrupted near base.
segment 1.
segment 1.
brown, dark brown, or deep olive green, usually with numerous reddish brown spots and whitish warts, strongly convex abaxially, usually strongly concave adaxially, elongate-obovate or obovate-elliptic, broadest beyond middle, (4.2–)4.5–5(–5.2) × 2.5–3 mm;
wing not translucent or translucent only at margin, thick, 0.1–0.2(–0.3) mm wide (occasionally nearly absent), margins entire or irregularly erose, usually involute toward adaxial face of fruit, apex rostrate, triangular (wing long-adnate to style bases).
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.
Corispermum navicula
Corispermum hookeri
Corispermum navicula is very similar in its fruit morphology to the Siberian species C. bardunovii M. Popov ex M. Lomonosova (M. N. Lomonosova 1992). Probably, the two taxa represent results of parallel evolution (or parallel variability?) within North American and Asian representatives of the same species aggregate. The most distinctive character of both C. navicula and C. bardunovii, an elongated fruit body with almost parallel margins in the middle portion and distinctly triangular apex, shows a transition toward representatives of Corispermum sect. Declinata Mosyakin. Additional study of C. navicula would help clarify its relationships with other species. Some specimens from Oklahoma may also belong to C. navicula.
(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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