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Vascular Plants of California
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Eucephalus glabratus

Higher Taxonomy
Family: Asteraceae (Compositae)View DescriptionDichotomous Key
Habit: 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.
Genera In Family: +- 1500 genera, 23000 species: worldwide, many habitats. Note: 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; Bahia in Hymenothrix; 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 Picradeniopsis; Trimorpha in Erigeron; Venidium in Arctotis; Whitneya in Arnica. Amauriopsis in TJM2 (2012) treated here in Hymenothrix; Arida in Leucosyris; Bahia in Picradeniopsis.
Unabridged Note: Largest family of vascular plants in California and of eudicots globally.
eFlora Treatment Author: David J. Keil, except as noted
Scientific Editor: David J. Keil, Bruce G. Baldwin.
Genus: EucephalusView DescriptionDichotomous Key

Common Name: ASTER
Habit: Perennial herb from woody caudex or short rhizome. Stem: generally erect, 1--16 dm. Leaf: cauline, alternate, proximal generally scale-like, main leaves generally entire. Inflorescence: heads radiate or discoid, 1 or in cyme- or panicle-like clusters; involucre obconic to hemispheric; phyllaries +- equal or graduated in 3--6 series, free, +- keeled, margins papery, pale, sometimes +- red-tipped; receptacle +- flat, pitted, epaleate. Ray Flower: 0--13(21); corolla violet to pink or white. Disk Flower: many; corolla, anthers generally yellow, tube < throat; anther tip +- triangular; style branches flat on inner face, base +- warty, tip acute, hairy. Fruit: generally +- flattened, +- 1--2-ribbed, +- brown, +- hairy; pappus of bristles, generally in 2 series (outer +- 1 mm, inner generally 5--10 mm), +- white to +- brown.
Species In Genus: 10 species: North America. Etymology: (Greek: good head, describing involucre)
eFlora Treatment Author: Geraldine A. Allen
Reference: Allen 2006 FNANM 20:39--42
Unabridged Reference: Nesom 1994 Phytologia 77:141--297
Eucephalus glabratus (Greene) Greene
Stem: 3--6 dm, glabrous to +- glandular-hairy. Leaf: 3--6 cm, lanceolate to lance-ovate, generally obtuse, faces +- glabrous. Inflorescence: heads discoid or 1--2-rayed, in cyme-like cluster; phyllaries unequal, oblong to narrowly ovate, acute, +- tomentose, +- ciliate, base +- white, midvein green, tip green to purple. Ray Flower: 0--2(4), generally > 0 at least on some heads; corolla pale violet.
Ecology: Dry oak or conifer forest, rocky places; Elevation: 700--2400 m. Bioregional Distribution: KR, NCoRI; Distribution Outside California: southern Oregon. Flowering Time: Jul--Oct
Synonyms: Aster brickellioides Greene var. glabratus Greene; Aster siskiyouensis A. Nelson & J.F. Macbr.; Eucephalus glandulosus Eastw.
Jepson eFlora Author: Geraldine A. Allen
Reference: Allen 2006 FNANM 20:39--42
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)

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Botanical illustration including Eucephalus glabratus

botanical illustration including Eucephalus glabratus


Citation for this treatment: Geraldine A. Allen 2012, Eucephalus glabratus, in Jepson Flora Project (eds.) Jepson eFlora, /eflora/eflora_display.php?tid=80519, accessed on May 26, 2020.

Citation for the whole project: Jepson Flora Project (eds.) 2020, Jepson eFlora,, accessed on May 26, 2020.

Eucephalus glabratus
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© 2018 Dana York
Eucephalus glabratus
click for enlargement
© 2018 Dana York
Eucephalus glabratus
click for enlargement
© 2018 Dana York
Eucephalus glabratus
click for enlargement
© 2018 Dana York
Eucephalus glabratus
click for enlargement
© 2014 Dana York

More photos of Eucephalus glabratus in CalPhotos

Geographic subdivisions for Eucephalus glabratus:
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map of distribution 1
(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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Data provided by the participants of the  Consortium of California Herbaria.
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All markers link to CCH specimen records. The original determination is shown in the popup window.
Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.

CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time (fruiting time in some monocot genera).