Difference between revisions of "Psathyrotes"
Smithsonian Contr. Knowl. 5(6): 100. 1853.
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|name=Bulbostylis sect. Psathyrotus | |name=Bulbostylis sect. Psathyrotus | ||
|authority=Nuttall | |authority=Nuttall | ||
| + | |rank=section | ||
|publication_title=Proc. Acad. Nat. Sci. Philadelphia | |publication_title=Proc. Acad. Nat. Sci. Philadelphia | ||
|publication_place=4: 22. 1848 | |publication_place=4: 22. 1848 | ||
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|family=Asteraceae | |family=Asteraceae | ||
|illustrator=Linda Ann Vorobik | |illustrator=Linda Ann Vorobik | ||
| + | |illustration copyright=Flora of North America Association | ||
|distribution=sw United States;nw Mexico. | |distribution=sw United States;nw Mexico. | ||
|reference=strother1975a | |reference=strother1975a | ||
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|publication year=1853 | |publication year=1853 | ||
|special status= | |special status= | ||
| − | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V19-20-21/V21_1042.xml |
|tribe=Asteraceae tribe Heliantheae | |tribe=Asteraceae tribe Heliantheae | ||
|subtribe=Asteraceae (tribe Heliantheae) subtribe Gaillardiinae | |subtribe=Asteraceae (tribe Heliantheae) subtribe Gaillardiinae | ||
Latest revision as of 20:07, 5 November 2020
Annuals or perennials, 5–40+ cm. Stems erect or spreading, usually much branched. Leaves basal and cauline; alternate, petiolate; blades rounded-deltate, reniform, rounded-rhombic, or suborbiculate, margins toothed or entire, faces usually lanate, pilose, or tomentose, sometimes glandular-pubescent and/or furfuraceous as well. Heads discoid, borne singly. Involucres campanulate, cylindric, or turbinate, 3–6+ mm diam. Phyllaries falling or persistent, 8–24 in 2 (contrasting) series (distinct, lance-linear, lanceolate, obovate, or spatulate, tips erect or reflexed to squarrose). Receptacles flat to convex, smooth or ± pitted, epaleate. Ray florets 0. Disc florets bisexual, fertile; corollas yellowish, tubes much shorter than cylindric throats, lobes 5, erect, deltate (style-branch apices rounded-truncate). Cypselae cylindro-fusiform to obpyramidal; pappi of 35–150 distinct or basally connate bristles in 1–4 series. x = 17.
Distribution
sw United States, nw Mexico.
Discussion
Species 3 (3 in the flora).
Selected References
Lower Taxa
Key
| 1 | Margins of all leaves entire (margins and veins bearing straight, multicellular hairs 2–3+ mm); cypselae 4–5 mm | Psathyrotes pilifera |
| 1 | Margins of at least some leaves toothed (faces hairy, hairs not 2–3+ mm); cypselae 1.5–3.5 mm | > 2 |
| 2 | Plants lanate and furfuraceous; outer phyllaries spatulate to obovate, tips squarrose to reflexed; florets 16–32; pappi of 120–140 bristles | Psathyrotes ramosissima |
| 2 | Plants sparsely tomentose and furfuraceous; outer phyllaries lance-linear, tips erect; florets 10–20; pappi of 35–50 bristles | Psathyrotes annua |