Difference between revisions of "Pectis cylindrica"
in N. L. Britton et al., N. Amer. Fl. 34: 198. 1916.
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|common_names=Three-rayed or Sonoran chinchweed | |common_names=Three-rayed or Sonoran chinchweed | ||
| − | |basionyms={{Treatment/ID/ | + | |basionyms={{Treatment/ID/Basionym |
|name=Pectis prostrata var. cylindrica | |name=Pectis prostrata var. cylindrica | ||
|authority=Fernald | |authority=Fernald | ||
| + | |publication_title=Proc. Amer. Acad. Arts | ||
| + | |publication_place=33: 68. 1897 | ||
}} | }} | ||
|synonyms= | |synonyms= | ||
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|publication year=1916 | |publication year=1916 | ||
|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/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V19-20-21/V21_541.xml |
|tribe=Asteraceae tribe Heliantheae | |tribe=Asteraceae tribe Heliantheae | ||
|subtribe=Asteraceae (tribe Heliantheae) subtribe Pectidinae | |subtribe=Asteraceae (tribe Heliantheae) subtribe Pectidinae | ||
Revision as of 18:49, 24 September 2019
Annuals, 1–20 cm (across or high); herbage not scented. Stems prostrate to ascending (often mat-forming, densely leafy distally), puberulent (in decurrent lines or throughout) or glabrate. Leaves (bluish green) linear to linear-oblanceolate or narrowly oblong, 10–30 × 1.5–4 mm, margins with 2–5 pairs of setae 1–2 mm, faces glabrous (abaxial densely dotted with scattered, circular oil-glands 0.05–0.2 mm). Heads borne singly or in congested, (leafy) cymiform arrays. Peduncles 1–5 mm. Involucres cylindric. Phyllaries coherent (falling together), oblong to oblong-obovate, 6–10 × 2–3 mm (dotted with scattered, elliptic oil-glands 0.05–0.15 mm). Ray florets 3(–4); corollas 3–4 mm (scarcely surpassing phyllaries). Disc florets (3–)7–14; corollas 2.2–2.6 mm (2-lipped). Cypselae 4–5.5 mm, puberulent (distally glandular-puberulent); pappi of 2 (ray) and 5 (disc) lanceolate scales 1.5–3.5 mm. 2n = 48.
Phenology: Flowering Jul–Nov.
Habitat: Deserts, oak-juniper woodlands, grasslands, wash channels, mud flats, lawns, roadsides
Elevation: 700–1500 m
Distribution
Ariz., N.Mex., Tex., Mexico (Baja California Sur, Chihuahua, Coahuila, Durango, Nuevo León, Sinaloa, Sonora).
Discussion
Pectis cylindrica (2n = 48) is similar to P. prostrata (2n = 24); the two occasionally grow together (D. J. Keil 1975b). Some herbaria contain mixed collections of the two. No evidence is available of hybrids between the two.
Selected References
None.