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Key to families | Table of families and genera
Indexes to all accepted names and synonyms:
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Annual to tree. Leaf: basal and/or cauline, alternate, opposite, rarely whorled, simple to 2+ × compound. Inflorescence: 1° inflorescence a head, resembling a flower, of several types (see below), 1–many in generally ± cyme-like cluster; each head generally with ± calyx-like involucre of 1–many series of phyllaries (involucral bracts); receptacle of head flat to conic or columnar, paleate (bearing paleae = receptacle bracts) or epaleate; flowers 1–many per head. Flower: bisexual, unisexual, or sterile, ± small, of several types (see below); calyx 0 or modified into ± persistent pappus of bristles, scales, and/or awns; corolla radial or bilateral (0), lobes generally (0)3–5; stamens 4–5, filaments generally free, generally fused to corolla at tube/throat junction, anthers generally fused into cylinder around style, anther base generally rounded or cordate (deeply sagittate or with tail-like appendages), tip (= flattened appendage) generally projecting beyond pollen sac; pistil 1, 2-carpeled, ovary inferior, 1-chambered, 1-seeded, placenta basal, style 1, tip generally ± 2-branched (except in some staminate disk flowers), branch tips truncate or generally bearing ± brush-like appendages; stigmas 2, generally on adaxial faces of style branches. Fruit: achene (also called a cypsela) (drupe in Chrysanthemoides), cylindric to ovoid, sometimes compressed, generally deciduous with pappus attached.
± 1500 genera, 23000 species: worldwide, many habitats. Flower and head types differ in form and sexual condition. A disk flower has a generally radial corolla, with a cylindric tube, expanded throat, and generally 5 lobes. Disk flowers are generally bisexual and fertile but occasionally staminate with reduced ovaries. Discoid heads comprise only disk flowers. A radiant head is a variant of a discoid head, with peripheral disk flower corollas expanded, often bilateral. A ray flower corolla is bilateral, generally with a slender tube and flattened petal-like ray (single lip composed of generally 3 lobes). Ray flowers are generally pistillate or sterile (occasionally lacking styles). Radiate heads have peripheral ray flowers and central disk flowers. Disciform heads superficially resemble discoid heads, with pistillate or sterile flowers that lack rays, together with or separate from disk flowers. A ligulate flower is bisexual, with a bilateral, generally ephemeral corolla and 5-lobed ligule. Liguliflorous heads comprise only ligulate flowers. See glossary p. 31 for illustrations of family characteristics. Echinops sphaerocephalus L., Gaillardia aristata Pursh, Gaillardia pulchella Foug., Hymenothrix loomisii S.F. Blake, Tagetes erecta L., Thelesperma megapotamicum (Spreng.) Kuntze are waifs. Melampodium perfoliatum Kunth, historic urban waif. Ageratum conyzoides L., Guizotia abyssinica (L. f.) Cass., Santolina chamaecyparisus L., orth. var. are rare or uncommon escapes from cultivation. Dyssodia papposa, Ismelia carinata (Schousb.) Sch. Bip. [Chrysanthemum carinatum Schousb.], Mantisalca salmantica (L.) Briq. & Cavill. are historical or extirpated waifs in California. Inula helenium L. not documented in California. Taxa of Aster in TJM (1993) treated here in Almutaster, Eucephalus, Eurybia, Ionactis, Oreostemma, Sericocarpus, Symphyotrichum; Chamomilla in Matricaria; Cnicus in Centaurea; Conyza in Erigeron and Laennecia; Dugaldia in Hymenoxys; Erechtites in Senecio; Hymenoclea in Ambrosia; Lembertia in Monolopia; Osteospermum ecklonis in Dimorphotheca; Picris echioides in Helminthotheca; Prionopsis in Grindelia; Raillardiopsis in Anisocarpus and Carlquistia; Schkuhria multiflora in Bahia; Trimorpha in Erigeron; Venidium in Arctotis; Whitneya in Arnica. Taxa of Arida in TJM2 (2012) treated here in Leucosyris. —Scientific Editors: David J. Keil, Bruce G. Baldwin.
Unabridged note: Largest family of vascular plants in California and of eudicots globally.
Key to Asteraceae
1 sp.: western United States. (Latin: rigid pappus) [Roberts & Urbatsch 2003 Taxon 52:209–228; Strother 2006 FNANM 20:48–49] Similar, closely related to Pentachaeta, Tracyina.
Annual 5–30+ cm, taprooted; generally self-pollinated. Stem: generally erect, simple or with branches often exceeding main stem, minutely soft- to coarse-hairy, glabrous in age. Leaf: basal and at flower mostly cauline, alternate, ± sessile, mostly 9–30+ mm, 1–2(5+) mm wide, narrowly oblanceolate to lance-linear or linear, entire, glabrous or sparsely and minutely coarse-hairy, 1(3)-veined. Inflorescence: heads radiate, 1, at stem tips; peduncle often wiry, ± minutely coarse- to soft-hairy near heads; involucre 4–7+ mm, 1–3(5+) mm wide, ± cylindric to obconic; phyllaries 11–20+ in 2+ series, free, ± equal, linear to lanceolate or awl-shaped, green, minutely coarse-hairy, inner generally each ± enclosing a flower, margins scarious; receptacle ± flat, faintly pitted, paleae between ray and disk flowers (easily overlooked). Ray flower: 3–13+ (generally 3, 5, or 8); corolla ± yellow, often red- or purple-tinged, tube 1.5–2+ mm, ray inconspicuous, 0.3–1 mm, narrowly elliptic. Disk flower: 5–70+; corolla pale yellow, occasionally distally purple, tube 0.2–0.4 mm, throat 1–1.5 mm, lobes 2–4, 0.1–0.3 mm; anther tip thread-like; style tips long-tapering distally. Fruit: 4–5 mm, ± cylindric to spindle-shaped, barely or not compressed, minutely wrinkled, all minutely coarse-hairy or ray fruit ± glabrous in age; pappus generally of 3–5 awl-shaped scales, 1–4+ mm or in rays occasionally much reduced or 0, persistent.
2n=18. Grassy sites, openings among shrubs or trees; 100–2200 m. Northwestern California (except North Coast), Cascade Range, Sierra Nevada, Great Central Valley, Central Western California, Western Transverse Ranges, San Gabriel Mountains, Modoc Plateau; to Washington, Idaho, Nevada. Apr–Jul [Online Interchange]
Previous taxon: Rigiopappus
Next taxon: Rudbeckia
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Oct 4 2015
Citation for this treatment: [Author of taxon treatment] 2013. Rigiopappus, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=4579, accessed on Oct 4 2015
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|Geographic subdivisions indicated for the distribution of Rigiopappus leptocladus|| Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).
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