Corispermum navicula
Corispermum pallasii
boat-shape bugseed, crescent bugseed
Pallas' bugseed, Siberian bugseed
blades linear-lanceolate, linear, occasionally narrowly lanceolate, usually plane, (1.5–)2–4 × 0.1–0.5 cm.
blades linear-lanceolate, linear, or occasionally narrowly linear, usually plane, 1.5–4 × (0.1–)0.2–0.4(–0.5) 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 (rarely narrowly ovate-lanceolate), ca. (0.5–)1–3 × 0.4–0.8 cm.
compact and dense, ovoid, ovate or oblong-obovate.
usually compact and dense, rarely ± lax and interrupted in proximal 1/2, clavate, narrowly clavate, or almost ovate in outline.
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).
light brown, brown, dark brown, or deep olive green, often with reddish brown spots and whitish warts, convex abaxially, usually plane or slightly concave adaxially, obovate or obovate-elliptic, usually broadest beyond middle, (3.2–)3.5–4.5(–4.7) × (2–)2.4–3 mm;
wing translucent only at margin (or in marginal 1/2), thick, 0.2–0.4(–0.5) mm wide, margins entire or indistinctly erose, apex broadly triangular, rarely rounded or very indistinctly emarginate.
Corispermum navicula
Corispermum pallasii
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.)
Corispermum pallasii is placed in subsect. Pallasiana Mosyakin, which is evidently of Asian origin. Related taxa are widespread in southern Siberia, central Asia, Mongolia, and China. It is also widespread in Europe, where it was most probably initially introduced in Germany by German botanists and gardeners, who obtained seeds from Siberia through Russian botanical gardens (G. F. Schnittspahn 1851; U.-V. Köck 1986). In Europe this species was known as C. leptopterum (Ascherson) Iljin. It is not known yet whether this species was introduced to North America or is at least partly native within its North American range. Judging from the very close taxonomic affinity of C. pallasii to other, native North American taxa (e.g., C. americanum, C. villosum, C. ochotense, C. hookeri) and morphological similarity of its fruits to some fossil Corispermum fruits, the hypothesis of the native status of C. pallasii in North America seems to be preferable; secondary introduction of some populations from Europe is also not improbable.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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