Difference between revisions of "Geraea"
Proc. Amer. Acad. Arts 1: 48. 1847.
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|publication year=1847 | |publication year=1847 | ||
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− | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/ | + | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V19-20-21/V21_298.xml |
|tribe=Asteraceae tribe Heliantheae | |tribe=Asteraceae tribe Heliantheae | ||
|subtribe=Asteraceae (tribe Heliantheae) subtribe Ecliptinae | |subtribe=Asteraceae (tribe Heliantheae) subtribe Ecliptinae |
Revision as of 19:48, 24 September 2019
Annuals or perennials, 10–100 cm. Stems erect, branched (branches ascending). Leaves basal and cauline; alternate; sessile or petiolate; blades (3-nerved) elliptic, lanceolate, oblanceolate, oblong, or ovate, bases auriculate or tapering, margins entire or toothed, faces ± canescent or glandular-puberulent to stipitate-glandular. Heads radiate or discoid, borne singly or in open, paniculiform arrays (peduncles usually longer than involucres). Involucres hemispheric, 7–15 mm diam. Phyllaries persistent, 20–30+ in 2–3+ series (distinct, narrowly lanceolate to linear or narrowly lance-oblong to lance-ovate, subequal to unequal, outer shorter). Receptacles convex, paleate (paleae ± conduplicate, folded around and falling with cypselae). Ray florets 0 or 10–21, neuter; corollas yellow. Disc florets 60–200+, bisexual, fertile; corollas yellow, tubes shorter than gradually to abruptly expanded throats, lobes 5, triangular. Cypselae (black) strongly compressed, narrowly cuneate (margins ± white, long-ciliate, faces ± hairy); pappi persistent, of 2 awns or subulate scales. x = 18.
Distribution
sw United States, nw Mexico.
Discussion
Species 2 (2 in the flora).
Selected References
None.
Lower Taxa
Key
1 | Annuals; leaves sessile or petiolate, bases of blades tapering to wings, faces ± canescent; phyllaries narrowly lanceolate to linear, apices acute (margins shaggy-ciliate); ray florets 10–21 | Geraea canescens |
1 | Perennials; leaves sessile, bases of blades ± auriculate, faces glandular-puberulent; phyllaries narrowly lance-oblong to lance-ovate, apices obtuse (faces densely glandular-puberulent); ray florets 0 | Geraea viscida |