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| Jepson eFlora
Key to families | Table of families and genera This text currently parallels The Jepson Manual: Vascular Plants of California, Second Edition that is now available at the University of California Press. Text appearing in blue on this page will not appear in the printed book; it will be displayed only on the Web. Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link. |
Annual 0.5–14 cm, ± green to ± gray, cobwebby or tomentose.
Stem: 0, or 1, erect, or 2–10, ascending to prostrate, ± forked, ± leafless between distal forks.
Leaf: basal and/or cauline, ± alternate, ± sessile or petioled, linear-oblanceolate to spoon-shaped, entire; distal leaves subtending heads, crowded, largest > proximal leaves (sometimes ± grading into paleae in Ancistrocarphus keilii).
Inflorescence: heads disciform, sessile, 1 or 2–5 per group; involucre 0, simulated by paleae or leaves, or involucre ± cup-like, then phyllaries 3–6, ± equal, round, << paleae, membranous, persistent, sometimes vestigial; receptacle length 1–2 × width, mushroom- or hourglass-shaped, glabrous; paleae of pistillate flowers each enclosing a flower, ± persistent with fruit, ± boat-shaped, ± acute, woolly abaxially, prominently 3-veined or middle vein obscure, margin reflexed distally as a scarious wing, wing terminal, erect to curved inward, hidden or visible in head; paleae of disk flowers generally 5, ± enlarged, spreading proximally, hooked or curved inward distally, open, concave, ± lanceolate or ± obovate, acuminate or abruptly papery-pointed, cartilaginous, ± green, tomentose.
Pistillate flower: 5–11, each subtended by a palea; corolla obscure, narrowly cylindric.
Disk flower: 3–6, staminate; pappus 0; corolla 4–5(6)-lobed; anther base tailed, tip ± triangular; style tips ± linear-oblong.
Fruit: each enclosed by a palea, obovoid, compressed front-to-back, smooth, dull, corolla scar terminal; pappus 0.
2 species: w North America. (Greek: fishhook chaff) [Morefield 2006 FNANM 19:465–466] Closely related to Hesperevax.
Unabridged references: [Morefield 2004 Novon 14:463–475]
1. St (1)2–10(14) cm, ± forked; leaves basal and cauline; paleae of disk flowers becoming 2.7–4.1 mm, ± lanceolate; palea tip exserted from head, hooked inward, acuminate, stiff, forming a spine; fruit 1.4–2 mm, 0.6–0.9 mm wide, proximally dark-banded ..... A. filagineus
1' St 0; leaves basal; paleae of disk flowers becoming 1.8–2.8 mm, ± obovate; palea tip included in head, curved inward, rounded, abruptly papery-pointed, not forming a spine; fruit 1–1.4 mm, 0.5–0.6 mm wide, not dark-banded ..... A. keilii
Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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