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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 (involucre 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
Annual to perennial herb (subshrub). Stem: generally erect. Leaf: alternate, generally sessile, generally entire (toothed or lobed to ternately dissected). Inflorescence: heads generally radiate (discoid, disciform), 1–few (many), peduncled; inflorescence generally ± flat-topped (raceme- to panicle-like); involucre urn- to bell-shaped or generally hemispheric; phyllaries linear to narrowly lanceolate, in 2–several series, ± equal to strongly graduated, generally ascending or erect in flower, generally green, spreading when pressed, reflexed when dry; receptacle flat to steeply conic, smooth to shallowly pitted, epaleate. Ray or pistillate flower: (0)10–generally many; ray generally narrow, generally white or pink to lavender or blue-purple (yellow), generally spreading when fresh, often coiled or reflexed when dry. Disk flower: generally many; corolla generally narrowly funnel-shaped, yellow; anther tip ± lanceolate; style tips 0.1–0.8 mm, ± triangular. Fruit: generally 0.5–3 mm, generally ± oblong, compressed to ± cylindric, generally 2-ribbed, generally sparsely hairy; pappus (0) generally double, outer of short bristles, narrow scales, or a short crown, inner of 6–50 long bristles.Key to Erigeron
± 375 species: worldwide. (Greek: early old age) [Nesom 2006 FNANM 20:256–348] Erigeron concinnus (Hook. & Arn.) Torr. & A. Gray var. condensatus D.C. Eaton, Erigeron disparipilus Cronquist, and Erigeron lobata A. Nelson apparently not in California.
Unabridged references: [Noyes 2000 Plant Syst Evol 220:93–114]
Perennial herb 8–25 cm, from taproot and short-branched caudex, often densely cespitose. Stem: branched or unbranched, stiffly spreading-hairy, minutely glandular. Leaf: basal sometimes long-petioled, 4–7 cm, linear-oblanceolate, gradually reduced distally on stem, stiffly spreading-hairy. Inflorescence: heads ± disciform, 1–many; involucre 4–6 mm, 7–15 mm diam; phyllaries ± equal, coarsely long-hairy, minutely glandular. Pistillate flower: many; ray 0 or < involucre. Disk flower: corolla generally abruptly inflated to throat. Fruit: pappus bristles or narrow scales 12–17. [Online Interchange]
Stem: unbranched. Inflorescence: head 1.
Sagebrush or juniper scrub; 1800–2600 m. San Bernardino Mountains; to Utah. May–Sep [Online Interchange]
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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Nov 29 2015
Citation for this treatment: [Author of taxon treatment] 2013. Erigeron, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=7241, accessed on Nov 29 2015
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|Erigeron aphanactis var. congestus|
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© 2005 Aaron Schusteff
|Geographic subdivisions indicated for the distribution of Erigeron aphanactis var. congestus|| 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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