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352b. Perityle Bentham sect. Perityle
Annuals, perennials, or subshrubs (delicate or robust, sometimes weedy, in rock crevices or soil). Involucres campanulate to hemispheric, 3–11 × 4–14 mm. Ray florets 0 or (1–)8–18; corollas yellow or white. Disc florets 20–100+; corollas yellow (sometimes pink or purple tinged). Cypselae linear, linear-elliptic, linear-oblong, oblanceolate, oblong, ovate, or subcuneate, usually flattened (outer often 3-angled), margins usually prominently calloused, sometimes thin (not calloused), usually ± densely ciliate; pappi 0 or of 1–2(–3+), unequal to subequal, ± barbellate bristles 0.5–4(–6) mm, sometimes plus crowns of hyaline, laciniate scales. x = 17, 19.
Species 30 (7 in the flora): United States, Mexico, South America.
SELECTED REFERENCE Powell, A. M. 1974. Taxonomy of Perityle, section Perityle (Compositae–Peritylanae). Rhodora 76: 229–306.
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| 1 |
Ray florets 0 (Brewster and Terrell counties, Texas) |
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13 Perityle aglossa |
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Ray florets usually 6–18 (sometimes 0 or 1–6 in P. parryi from w Presidio County, Texas) |
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(2) |
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| 2 (1) |
Ray and disc corollas yellow; Texas |
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(3) |
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Ray corollas white, disc corollas yellow (sometimes purple tinged); Arizona, California, Nevada, New Mexico, Utah |
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(4) |
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| 3 (2) |
Leaves usually cordate to subreniform, margins usually irregularly dentate, laciniate, or ± 3-lobed, seldom more divided (perennials or subshrubs in rock crevices or in soil) |
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11 Perityle parryi |
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Leaves usually ternately lobed or ± cruciform, lobes usually again ternately lobed (perennials in soil) |
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12 Perityle vaseyi |
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| 4 (2) |
Annuals (sometimes persisting) |
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(5) |
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Subshrubs |
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(6) |
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| 5 (4) |
Cypselae (1.5–)2–3 mm, margins thin (not calloused); pappi 0, or of single, antrorsely to retrorsely barbellate bristles 1–3 mm plus crowns of hyaline, laciniate scales |
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7 Perityle emoryi |
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Cypselae 1.5–2 mm, margins prominently calloused; pappi of 2 unequal, antrorsely barbellate bristles 0.8–1.2 mm (the longest) plus crowns of hyaline, laciniate scales |
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8 Perityle microglossa |
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| 6 (4) |
Leaf blades deltate-ovate to ovate-rhombic, margins usually entire or serrate to serrate-crenate, sometimes shallow-lobed; c Arizona |
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9 Perityle ciliata |
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Leaf blades pedately lobed (lobes spatulate or linear) or 2–3-pinnatifid (lobes linear-filiform); s Arizona, New Mexico |
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10 Perityle coronopifolia |
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Lower Taxa
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