Diaperia prolifera
Diaperia prolifera var. barnebyi
big-head rabbit-tobacco, bighead pygmycudweed
Barneby rabbit-tobacco
mostly 2–10;
branches proximal and distal (distal opposite or, sometimes, appearing alternate when unequal), rarely none.
mostly 1–5;
branches equal to unequal, distal strictly ascending to erect.
largest 7–15 × 2–4 mm;
capitular leaves subtending glomerules, also visible between and surpassing heads.
largest 7–11 × 2–3 mm;
capitular leaves erect, involucral, proximally carinate, becoming indurate.
broadly or narrowly conic, 0.4–0.6 mm or ± 0.9–1.1 mm, heights 0.5–0.7 or 2–2.4 times diams.
narrowly conic, 0.9–1.1 mm, heights mostly 2–2.4 times diams.
0.
in strictly dichasiform or pseudo-polytomous arrays (sometimes appearing monochasiiform), cylindric to ± ellipsoid, 3.5–4.5 mm, heights 2–3 times diams.
borne singly, or 2–3 in largest glomerules.
± angular, obcompressed, mostly 0.9–1.2 mm.
paleae imbricate, longest 2.5–4 mm.
paleae: longest 2.5–3.2 mm.
paleae ± 3, apices erect to somewhat spreading, ± plane.
staminate florets 2–4;
ovaries partly developed, 0.4–0.6 mm;
corollas hidden in heads, actinomorphic, 1.4–2 mm, glabrous, lobes equal.
Diaperia prolifera
Diaperia prolifera var. barnebyi
Varieties 2 (2 in the flora).
Intermediates between the two varieties of Diaperia prolifera occur where their ranges meet in central Texas and central Oklahoma. The strictly dichasiform or pseudo-polytomous branching pattern of D. prolifera is distinctive and diagnostic within the genus. Specimens of D. prolifera from introductions around a wool mill in South Carolina (G. L. Nesom 2004c, as Evax prolifera) are as yet undetermined to variety and are not included in the distributions below.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Variety barnebyi is not particularly weedy. It occurs in southwestern Oklahoma, southeastern New Mexico, and western Texas (nearly to Mexico), largely allopatric with var. prolifera.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Plants grayish to greenish, loosely lanuginose; heads 4–40+ in largest glomerules; receptacle heights mostly 0.5–0.7 times diams.; capitular leaves usually ± spreading, scarcely involucral, not or scarcely carinate, pliant to somewhat rigid; distal branches mostly spreading to ascending; longest pistillate paleae 3.3–4 mm | var. prolifera |
1. Plants silvery white, tightly sericeous; heads borne singly, or 2–3 in largest glomerules; receptacle heights mostly 2–2.4 times diams.; capitular leaves erect, involucral, proximally carinate, becoming indurate; distal branches strictly ascending to erect; longest pistillate paleae 2.5–3.2 mm | var. barnebyi |
KS Wildflowers
LA Plants
MO Plants
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