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Vascular Plants of California
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Hemizonella minima

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: HemizonellaView Description 


Species In Genus: 1 sp. Etymology: (Diminutive Hemizonia)
eFlora Treatment Author: Bruce G. Baldwin
Reference: Carlquist et al. 2003 Tarweeds and silverswords: evolution of the Madiinae (Asteraceae). Missouri Botanical Garden Press; Press; Baldwin & Strother 2006 FNANM 21:296--297
Hemizonella minima (A. Gray) A. Gray
Habit: Annual 1--20 cm. Stem: decumbent to erect, branches often widely divergent, minutely coarse-hairy, stalked-glandular. Leaf: basal and/or cauline, proximal opposite, distal alternate or clustered immediately proximal to branches, sessile, 5--25 mm, (0.5)1--2.5 mm wide, linear, entire or toothed, coarse-hairy, distally glandular-puberulent. Inflorescence: heads radiate (rays occasionally obscure), 1 or in flat-topped clusters; peduncle thread-like; involucre (1)2--4 mm diam, +- obovoid; phyllaries 3--5 in 1 series, each mostly or wholly enclosing a ray ovary, falling with fruit, (1)2--4 mm, +- oblanceolate, abaxially coarse-hairy and stalked-glandular; receptacle flat to convex, glabrous or sparsely bristly; paleae in 1 series between ray and disk flowers, fused, deciduous. Ray Flower: 3--5; corolla pale yellow, ray 0.5--1 mm. Disk Flower: 1--2; corolla 1--2.5 mm, pale yellow, tube +- = throat, hairy, lobes deltate; anthers yellow, tips hemispheric, minute; styles glabrous proximal to branches, tips awl-shaped, densely hairy.; anther bases sagittate. Fruit: ray fruit 1.8--2.8 mm, compressed front-to-back, arched, sparsely minutely bristly or +- glabrous, black, tip beaked, beak straight, oriented adaxially, 0.1--0.2 mm, pappus 0; disk fruit 1.8--2.8 mm, +- round in ×-section, club-shaped, +- minutely bristly, black, tip beaked, beak straight, oriented vertically, 0.1--0.2 mm, pappus 0.
Ecology: Gravelly or rocky, generally open sites in scrub, meadows, forest; Elevation: 300--2900 m. Bioregional Distribution: KR, NCoR, CaR, SN, se SnFrB, SCoRI (San Benito Mtn), SCoRO (Hanging Valley, Santa Lucia Range), TR, PR, MP; Distribution Outside California: to Washington, Montana, Nevada. Flowering Time: Apr--Aug Note: Self-fertile.
Synonyms: Madia minima (A. Gray) D.D. Keck
Jepson eFlora Author: Bruce G. Baldwin
Reference: Carlquist et al. 2003 Tarweeds and silverswords: evolution of the Madiinae (Asteraceae). Missouri Botanical Garden Press; Press; Baldwin & Strother 2006 FNANM 21:296--297
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)

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Botanical illustration including Hemizonella minima

botanical illustration including Hemizonella minima


Citation for this treatment: Bruce G. Baldwin 2012, Hemizonella minima, in Jepson Flora Project (eds.) Jepson eFlora, /eflora/eflora_display.php?tid=77569, accessed on April 09, 2020.

Citation for the whole project: Jepson Flora Project (eds.) 2020, Jepson eFlora,, accessed on April 09, 2020.

Hemizonella minima
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© 2005 Steve Matson
Hemizonella minima
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© 2005 Steve Matson
Hemizonella minima
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© 2008 Steve Matson
Hemizonella minima
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© 2008 George W. Hartwell
Hemizonella minima
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© 2009 Barry Breckling
Hemizonella minima
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© 2007 Neal Kramer

More photos of Hemizonella minima in CalPhotos

Geographic subdivisions for Hemizonella minima:
KR, NCoR, CaR, SN, se SnFrB, SCoRI (San Benito Mtn), SCoRO (Hanging Valley, Santa Lucia Range), TR, PR, MP
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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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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.
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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).