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|Family: Asteraceae (Compositae)||View Description||Dichotomous Key|
|Genus: Hemizonia||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Hemizonia congesta DC.
Habit: Annual 5--80 cm, often aromatic. Stem: +- erect. Leaf: basal and cauline, proximal opposite or in rosette, sometimes persistent, most alternate, sessile, 5--18+ cm, 2--8(12) mm wide, narrowly elliptic to linear or lance-linear, minutely serrate or entire, generally puberulent or coarse- to silky-hairy, distal often also stalked-glandular. Inflorescence: heads radiate, 1 or in +- panicle-, raceme-, or spike-like clusters or in tight groups; involucre hemispheric to +- urn-shaped or spheric, 3--8+ mm diam (rarely subtended by calyx-like set of 5--7 bractlets); phyllaries 5--14 in 1 series, linear to lanceolate or oblanceolate, each generally 1/2 enveloping a subtended ray ovary, falling with fruit, 3.5--12 mm, coarse- or soft-hairy, stalked-glandular; receptacle flat to conic, glabrous; paleae fused, forming cells around each disk flower, scarious, +- liquifying. Ray Flower: 5--14; corolla white or yellow, ray 5--12 mm, often purple-veined abaxially. Disk Flower: ; Fruit: ray fruit 2--3.5 mm, nearly round in ×-section (except +- flattened adaxially) or +- 3- angled (abaxially generally +- widely 2-faced, adaxially +- flattened to slightly bulging), glabrous, black, tip sometimes beaked, beak inconspicuous, straight, diam > length, pappus 0; disk fruit 0, pappus 0. Chromosomes: 2n=28.
eFlora Treatment Author: Bruce G. Baldwin
Jepson Online Interchange
Key to Hemizonia congestaPrevious taxon: Hemizonia
Next taxon: Hemizonia congesta subsp. calyculata
Citation for this treatment: Bruce G. Baldwin 2017. Hemizonia congesta, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=3365, accessed on January 16, 2017.
Citation for the whole project: Jepson Flora Project (eds.) 2017. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on January 16, 2017.