Difference between revisions of "Pectis angustifolia"
Ann. Lyceum Nat. Hist. New York 2: 214. 1827.
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Revision as of 22:47, 13 August 2020
Annuals or perennials, 1–20 cm (caudices slender, woody); herbage lemon-scented or spicy-scented. Stems erect or ascending, glabrous or puberulent. Leaves linear, 10–45 × 1–3 mm, margins with 2–5 pairs of bristles 1–2 mm, faces glabrous (dotted with oil-glands 0.2–0.7 mm). Heads in congested, cymiform arrays. Peduncles 1–20 mm. Involucres narrowly campanulate or cylindric. Phyllaries distinct, linear or narrowly oblanceolate, 2.5–5.5 × 0.5–1 mm (dotted subterminally with 1 or 2 swollen oil-glands and submarginally with 2–5 pairs of smaller oil-glands). Ray florets 8; corollas 3–5(–7) mm (glandular puberulent or nearly glabrous). Disc florets (7–)10–20; corollas 2.5–3.5 mm (sometimes weakly 2-lipped, glandular puberulent). Cypselae 2.5–4 mm, strigillose (hair tips straight, forked); pappi coroniform and/or of 0–7 scabrid awns or bristles 1–2 mm.
Distribution
Ariz., Colo., Kans., N.Mex., Nebr., Okla., Tex., Utah, Wyo., Mexico.
Discussion
Varieties 3 (3 in the flora).
Selected References
None.
Lower Taxa
Key
| 1 | Bases of distal leaves notably expanded (often partially concealing peduncles); pappi usually coroniform, 0.1–0.3 mm (plus 1–7 awns or bristles in some Texas populations); herbage lemon-scented | Pectis angustifolia var. angustifolia |
| 1 | Bases of distal leaves seldom expanded; pappi either of 0–4 awns 0.5–1(–2) mm and sometimes additionally coroniform, or of 0–7 awns or bristles 1–3 mm and/or coroniform; herbage usually spicy-scented | > 2 |
| 2 | Phyllaries widest near apices, each with subterminal oil gland 0.5–1 mm; pappi usually less than 1 mm; annuals or perennials; c Texas (Edwards Plateau) | Pectis angustifolia var. fastigiata |
| 2 | Phyllaries widest near middles, each with a subterminal oil-gland less than 0.5 mm; pappi often 1+ mm; annuals; s Texas, Mexico | Pectis angustifolia var. tenella |