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10. Pectis angustifolia Torrey, Ann. Lyceum Nat. Hist. New York. 2: 214. 1827.
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.
Varieties 3 (3 in the flora): w United States; Mexico.
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| 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 |
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10a Pectis angustifolia var. angustifolia |
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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 |
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(2) |
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| 2 (1) |
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) |
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10b Pectis angustifolia var. fastigiata |
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Phyllaries widest near middles, each with a subterminal oil-gland less than 0.5 mm; pappi often 1+ mm; annuals; s Texas, Mexico |
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10c Pectis angustifolia var. tenella |
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