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|Jepson eFlora: Taxon page
Key to families | Table of families and genera
Index to accepted names and synonyms:
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|Family: Asteraceae (Compositae)||View Description||Dichotomous Key|
|Genus:||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Habit: Annual to short-lived perennial herb; taprooted or fibrous-rooted. Stem: erect to +- ascending. Leaf: basal and cauline, +- sessile, linear to oblanceolate or spoon-shaped, entire, base tapered to +- cordate, generally +- densely tomentose. Inflorescence: heads disciform, generally in tight groups in generally spike- or panicle-like clusters, reduced to terminal cluster in small plants; involucre cylindric to +- urn-shaped, +- bell-shaped when pressed; phyllaries graduated in 3--7 series, bases stiff-papery to scarious, margins and tips transparent-membranous, often shiny, generally +- brown to straw-colored; receptacle flat, concave in fruit, smooth, epaleate. Pistillate Flower: pistillate 50--130; corolla narrowly tubular, yellow or distally +- purple to purple- to yellow-brown. Disk Flower: 2--7; corolla yellow or distally +- purple or purple- to yellow-brown; anther tip triangular; style tips truncate, hair-tufted. Fruit: oblong, slightly flattened, faces papillate; pappus bristles in 1 series, basally fused, deciduous in ring.
Species In Genus: +- 50 species: native to America, some species widely naturalized. Etymology: (Greek: united hair, for pappus bristles)
eFlora Treatment Author: Guy L. Nesom & Thomas J. Rosatti
Jepson Online Interchange
Key to GamochaetaPrevious taxon: Galinsoga parviflora var. parviflora
Next taxon: Gamochaeta argyrinea
Citation for this treatment: Guy L. Nesom & Thomas J. Rosatti 2016. Gamochaeta, Revision 1, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=444, accessed on May 26, 2016.
Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on May 26, 2016.