Corispermum americanum

(Nuttall) Nuttall

Trans. Amer. Philos. Soc., n. s. 5: 165. 1834.

Common names: American bugseed
Illustrated
Basionym: Corispermum hyssopifolium var. americanum Nuttall Gen. N. Amer. Pl. 1: 4. 1818
Synonyms: Corispermum imbricatum A. Nelson Corispermum marginale Rydberg Corispermum simplicissimum Lunell
Treatment appears in FNA Volume 4. Mentioned on page 315.

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. Inflorescences usually lax, interrupted, rarely ± condensed distally, linear, narrowly linear, or occasionally narrowly clavate. 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. Perianth segment 1. 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.

Distribution

Alta., B.C., Man., Ont., Que., Sask., Ariz., Ark., Calif., Colo., Idaho, Ill., Ind., Kans., Minn., Mo., Mont., N.Dak., N.J., N.Mex., N.Y., Nebr., Nev., Ohio, Okla., Oreg., S.Dak., Tex., Utah, Wash., Wis., Wyo., Mexico

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).

Selected References

None.

Key

1 Fruits (2.3-)2.5-3.5 mm, wing usually 0.2-0.3 mm wide (occasionally fruits almost wingless in some southwestern plants) Corispermum americanum var. ameri
1 Fruits (3-)3.5-4(-4.5) mm, wing usually 0.3-0.4(-0.5) mm wide. Corispermum americanum var. rydbe

"broadest" is not a number.

... more about "Corispermum americanum"
orbiculate +, elliptic +, obovate +, ovate +, lenticular +, , +, concave +, plane +  and convex to almost +
verrucose +
Sergei L. Mosyakin +
(Nuttall) Nuttall +
slippery +
aromatic +
10 cm100 mm <br />0.1 m <br /> (35 cm350 mm <br />0.35 m <br />) +
Corispermum hyssopifolium var. americanum +
small whitish +
convolute +, flat +, filiform +, linear +, linear-lanceolate +  and lanceolate +
2 cm20 mm <br />0.02 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
persistent +  and deciduous +
0.5 cm5 mm <br />0.005 m <br /> (?) +  and 2 cm20 mm <br />0.02 m <br /> (?) +
linear-lanceolate +, lanceolate +  and ovate-lanceolate +
0.3 cm3 mm <br />0.003 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
reddish-brown +, black +, brown +  and green +
American bugseed +
Alta. +, B.C. +, Man. +, Ont. +, Que. +, Sask. +, Ariz. +, Ark. +, Calif. +, Colo. +, Idaho +, Ill. +, Ind. +, Kans. +, Minn. +, Mo. +, Mont. +, N.Dak. +, N.J. +, N.Mex. +, N.Y. +, Nebr. +, Nev. +, Ohio +, Okla. +, Oreg. +, S.Dak. +, Tex. +, Utah +, Wash. +, Wis. +, Wyo. +  and Mexico +
horseshoe--shaped +
symmetric +, or +  and uniseriate +
0.23 cm2.3 mm <br />0.0023 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
brown +, light-brown +, greenish brown +  and yellowish-brown +
2.5mm;4.5mm +
dull +  and shiny +
obovate-elliptic +, obovate +, , +, concave +, plane +  and convex +
condensed +  and interrupted +
clavate +  and linear +
3.5 cm35 mm <br />0.035 m <br /> (4 cm40 mm <br />0.04 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (?) +  and 0.3 cm3 mm <br />0.003 m <br /> (?) +
erose +  and entire +
erose-denticulate +, undulate +  and entire +
0.2 cm2 mm <br />0.002 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
crassinucellate +  and bitegmic +
campylotropous +
1 +  and single +
persistent +  and deciduous +
nonadherent +  and adherent +
accrescent +
papery +  and chartaceous +
not accrescent +  and small +
Trans. Amer. Philos. Soc., n. s. +
pointing +  and ascending +
basal +, median +  and position +
bulbous +  and taprooted +
fusiform +
fleshy +  and fibrous +
characteristic +
verrucate +  and striate +
rounded +  and flattened +
Illustrated +
cylindric +
1 (?) +  and 3 (?) +
not armed +, not jointed +  and branched +
opposite +  and alternate +
ascending +  and erect +
not fleshy +
sessile +  and petiolate +
reduced;small +
horizontal +  and vertical +
verrucate +
Corispermum imbricatum +, Corispermum marginale +  and Corispermum simplicissimum +
Corispermum americanum +
Corispermum +
species +
whitish +  and reddish-brown spots +
polygamous +, dioecious +  and monoecious +
0.2mm;0.3mm +