Difference between revisions of "Heterotheca Cassini (Q2262)"
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Latest revision as of 12:51, 24 June 2022
Heterotheca is a taxon with the rank genus within the tribe Astereae
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Heterotheca Cassini
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Heterotheca is a taxon with the rank genus within the tribe Astereae
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taxon/id/Heterotheca Cassini
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Heterotheca Cassini
Heterotheca
Cassini
FNA Editorial Committee. 2006. Flora of North America north of Mexico. Volume 20: Magnoliophyta: Asteridae, part 7: Asteraceae, part 2. Oxford University Press, New York.
accepted
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stout taprooted or with woody caudices, sometimes also rhizomatous.
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Stems ascending-erect, branched distally, appressed-strigose and hispid, sparsely to abundantly long-hispid or hirsute (hairs spreading, long, cells osteolate, walls minutely pustulate).
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petiolate (petiole basal margins always coarsely, spreading-ciliate) or sessile;
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proximal blades 1-nerved, ovate-oblanceolate (bases tapering), hairy;
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distal smaller (bases sometimes clasping), margins (sometimes undulate) serrate to entire, faces hispid to strigose, stipitate-glandular.
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Heads radiate (discoid in H. oregona), borne singly or in corymbiform arrays, sometimes becoming paniculiform.
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Involucres campanulate to turbinate (campanulo-hemispheric upon drying), (3–14 ×) 3.8–23 mm.
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Phyllaries 26–80 in 3–5 series, 1-nerved (usually raised; keeled proximally), lanceolate to linear-lanceolate, usually strongly unequal (usually stiff), margins scarious (sometimes distally reddish purple), sparsely to densely strigose (hairs short to long), eglandular to densely stipitate-glandular (usually more densely so distally).
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Receptacles slightly convex, subulate, pitted, epaleate.
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Ray-florets (4–) 30 (0 in H. oregona), pistillate, fertile;
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corollas yellow (tubes glabrate to short-pilose, laminae usually eglandular, sometimes stipitate-glandular proximally).
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Disc-florets 9–110;
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corollas yellow, ampliate, tubes shorter than narrowly funnelform throats (glabrate to sparsely, minutely strigose, hairs 0.5–1.5 mm in 2 species, sometimes minutely glandular), lobes 5, erect to spreading, deltate, triangular, or lanceolate;
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style-branch appendages narrowly triangular.
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Cypselae sometimes dimorphic, obconic, compressed or not, of ray-florets often 3-angled, 4–12-ribbed, faces glabrous or densely strigillose;
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pappi 0 or in 3–4 series, outer of 3–40 (sometimes obscure) linear to linear-lanceolate or triangular scales (0.2–1 mm), inner of 30–45 off-white, stramineous, or tan to rusty brown, barbellate, apically clavate or attenuate bristles (3–11 mm).
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sparsely abundantly long-hispid or hirsute
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sparsely abundantly long-hispid or hirsute
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linear-lanceolate or triangular
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