Difference between revisions of "Perityle dissecta"
in A. Gray et al., Syn. Fl. N. Amer. 1(2): 320. 1884.
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|distribution=Tex.;Mexico (Chihuahua). | |distribution=Tex.;Mexico (Chihuahua). | ||
|discussion=<p>Of conservation concern.</p><!-- | |discussion=<p>Of conservation concern.</p><!-- | ||
| − | --><p>Perityle dissecta occurs in southern Brewster and Presidio counties. It and P. lemmonii have been considered conspecific by some taxonomists because of similarities in gross leaf morphology. The differences in phyllaries, disc corollas, and pappus bristles, as well as distinct distributions, support recognizing them as separate species.</p> | + | --><p><i>Perityle dissecta</i> occurs in southern Brewster and Presidio counties. It and <i>P. lemmonii</i> have been considered conspecific by some taxonomists because of similarities in gross leaf morphology. The differences in phyllaries, disc corollas, and pappus bristles, as well as distinct distributions, support recognizing them as separate species.</p> |
|tables= | |tables= | ||
|references= | |references= | ||
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|publication year=1884 | |publication year=1884 | ||
|special status= | |special status= | ||
| − | |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/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V19-20-21/V21_827.xml |
|tribe=Asteraceae tribe Heliantheae | |tribe=Asteraceae tribe Heliantheae | ||
|subtribe=Asteraceae (tribe Heliantheae) subtribe Peritylinae | |subtribe=Asteraceae (tribe Heliantheae) subtribe Peritylinae | ||
Revision as of 16:37, 18 September 2019
Perennials or subshrubs, 7–20 cm (densely leafy); pilose. Leaves: petioles (3–)4–10 mm; blades lanceolate to deltate, 4–15 × 4–15 mm, usually 1–3-pinnately divided, lobes irregular, rounded, ultimate margins laciniate. Heads borne singly or in corymbiform arrays, 8–10 × 4–5 mm. Peduncles 2–8(–17) mm. Involucres campanulate. Phyllaries 12–15, linear to linear-lanceolate, (5–)7–13 × 0.5–0.9 mm (apices usually attenuate, sometimes acute). Ray florets 0. Disc florets 20–30; corollas yellow, tubes 1–1.5 mm, throats usually narrowly tubular, (2–)2.5–2.8 mm, lobes 0.7–1 mm. Cypselae oblong to narrowly oblanceolate, (2.8–)3–3.8 mm, margins moderately calloused, short-hairy; pappi 0, or of 1(–4) moderately stout bristles (1–)2.2–3 mm. 2n = 34, 68.
Phenology: Flowering spring–fall.
Habitat: Limestone walls of canyons
Elevation: 800–1200 m
Distribution
Tex., Mexico (Chihuahua).
Discussion
Of conservation concern.
Perityle dissecta occurs in southern Brewster and Presidio counties. It and P. lemmonii have been considered conspecific by some taxonomists because of similarities in gross leaf morphology. The differences in phyllaries, disc corollas, and pappus bristles, as well as distinct distributions, support recognizing them as separate species.
Selected References
None.