Pectis prostrata |
Pectis linifolia |
|
---|---|---|
spreading chinchweed, spreading cinchweed |
romero-macho |
|
Habit | Annuals, 1–30 cm (across); herbage not scented. | |
Stems | prostrate to ascending (often mat-forming, densely leafy, especially distally), puberulent (in lines or throughout). |
|
Leaves | linear to narrowly oblanceolate, 10–40 × 1.5–7 mm, margins with 4–12 pairs of setae 1–3 mm, faces glabrous (abaxial densely dotted with round oil-glands 0.1–0.3 mm). |
|
Peduncles | 1–2 mm. |
|
Involucres | campanulate, cylindric, or ellipsoid. |
|
Ray florets | 5; corollas 2.5–3.5 mm (scarcely surpassing phyllaries). |
|
Disc florets | 3–17; corollas 1.8–2.5 mm (2-lipped). |
|
Phyllaries | coherent (falling together), oblong to obovate, 5–8 × 1–3 mm (often dotted in submarginal rows and sometimes along midribs with elliptic oil-glands 0.1–0.3 mm). |
|
Heads | borne singly or in congested, (leafy) cymiform arrays. |
|
Cypselae | 2.5–4.5 mm, strigillose; pappi of 2 (ray) or 5 (disc) lanceolate scales 1.5–2.5 mm. |
|
2n | = 24. |
|
Pectis prostrata |
Pectis linifolia |
|
Phenology | Flowering Jul–Nov. | |
Habitat | Open sites in deserts, grasslands, oak-pine-juniper woodlands, roadsides | |
Elevation | 0–2000 m (0–6600 ft) | |
Distribution |
AZ; FL; LA; NM; TX; Mexico; Central America; West Indies
|
AZ; FL; Mexico; Central America; South America; West Indies; Pacific Islands |
Discussion | The development of roads and highways has created ideal habitats for Pectis prostrata. Its range appears to be expanding along the coasts of Florida; it was discovered in Louisiana relatively recently. It can be expected to spread along the Gulf Coast and perhaps northward along the Atlantic Coast as well. Autogamy has apparently assisted P. prostrata to spread rapidly as suitable new habitats have become available. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Varieties 2 (1 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 21, p. 224. | FNA vol. 21, p. 230. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Pectidinae > Pectis | Asteraceae > tribe Heliantheae > subtribe Pectidinae > Pectis |
Sibling taxa | ||
Subordinate taxa | ||
Name authority | Cavanilles: Icon. 4: 12, plate 324. (1797) | Linnaeus: Syst. Nat. ed. 10, 2: 1221. (1759) |
Web links |