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|Family: Asteraceae (Compositae)||View Description||Dichotomous Key|
|Genus: Erigeron||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Erigeron sumatrensis Retz.
Habit: Annual 30--200+ cm. Stem: erect, leafy, branched distally or throughout, puberulent or long-soft-hairy to bristly, hairs +- ascending; central stem generally exceeding branches. Leaf: margin +- fine-strigose, faces +- glabrous to puberulent, densely strigose, or bristly, hairs +- erect on veins; basal and proximal cauline 5--10 cm, 5--20 mm wide, +- petioled, linear to elliptic or oblanceolate, entire or toothed, generally withered by flowering; distal similar, sessile, smaller, generally entire. Inflorescence: heads disciform, many in panicle-like to +- flat-topped clusters; involucre 4--5 mm, 3--4 mm diam, +- urn-shaped in flower; phyllaries weakly graduated, +- glabrous to puberulent, densely strigose, or spreading-hairy, green when fresh, central part of middle phyllaries generally wider than lighter margin, not red-brown or resin filled when dry; receptacle 1--2.5 mm diam in fruit. Pistillate Flower: 60--90+; ray 0--0.3 mm, white or cream. Disk Flower: 6--10. Fruit: 1--1.5 mm, pale tan (generally some with +- red ribs), sparsely minutely strigose or +- glabrous; pappus bristles 15--25, 3--4 mm, cream to tan.
Ecology: Disturbed sites; Elevation: < 600+ m. Bioregional Distribution: NW (exc NCoRH), CaRF, n SNF, ScV, CW (exc SCoRI), SCo, ChI, PR (exc SnJt); Distribution Outside California: widely naturalized; native to South America. Flowering Time: All year
Synonyms: Conyza sumatrensis (Retz.) E. Walker; Conyza floribunda Kunth; Conyza bilbaoana J. Rémy, misappl.
Unabridged Note: Pruski & Sancho 2006 Novon 16:96--101 distinguished two varieties of Conyza sumatrensis. Herbage and phyllaries of var. sumatrensis are +- densely hairy with soft to stiff appressed to spreading hairs. Leaves and stems of var. leiotheca (S.F. Blake) Pruski & G. Sancho are +- glabrous to sparsely hairy, and phyllaries are glabrous or rarely weakly puberulent. Some California plants approach var. leiotheca. Varietal names for these taxa have not been published in Erigeron, and ranges of the forms in California are not distinguished here.
eFlora Treatment Author: David J. Keil & Guy L. Nesom
Jepson Online Interchange
Previous taxon: Erigeron strigosus var. strigosus
Next taxon: Erigeron supplex
Citation for this treatment: David J. Keil & Guy L. Nesom 2016. Erigeron sumatrensis, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=91898, accessed on October 22, 2016.
Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on October 22, 2016.