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|Family: Apocynaceae||View Description||Dichotomous Key|
|Genus: Asclepias||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Asclepias latifolia (Torr.) Raf.
Habit: Perennial herb, very hairy, less so in age. Stem: erect. Leaf: opposite; petiole short to 0; blade generally wide-elliptic (lanceolate, ovate), base tapered, obtuse, or cordate, tip obtuse to truncate or notched, generally mucronate. Inflorescence: peduncle [0--]1.5--2.7 cm. Flower: corolla reflexed to spreading, cream-green, purple-tinged abaxially or not; hoods +- elevated above corolla base, exceeded by to at +- same level as anther head, cream, purple-tinged or not; horns exserted, at +- same level as hoods, converging over anther head or not. Fruit: erect on +- reflexed pedicels. Seed: 7--8 mm. Chromosomes: 2n=22.
Ecology: Dry washes; Elevation: +- 150 m. Bioregional Distribution: NCoRI (Rumsey, Yolo Co., 1912, extirpated); Distribution Outside California: to South Dakota, Texas, Mexico. Flowering Time: May--Jun
Unabridged Note: Based on key in Woodson: UC449991 (Tracy I. Storer; Jun 29, 1912; Rumsey, Yolo Co.), identified on label doubtfully as Asclepias latifolia (Torr.) Raf., may belong instead to Asclepias eriocarpa Benth. (peduncles in Asclepias latifolia 0--1.5 cm, in Asclepias eriocarpa 1--10 cm; on specimen +- 2.5 cm, and flowers few and past their prime); the material in a photocopy of MO1170403 (R.W. Schery & E. Curtis; July 19, 1939, 30 miles west of Grant Park, county not indicated, but the only Grant Park in the Jepson Place Name Index is in southwestern Ventura Co., well within the range of Asclepias eriocarpa and Asclepias erosa, but quite far away from the one dot indicated in California for Asclepias latifolia by Woodson, which evidently is in Inyo Co., possibly representing a locality within 30 miles -- but to the east -- of the Grant Grove area of Kings Canyon National Park, known in 1939 as General Grant National Park or simply Grant Park), identified on label (handwritten on otherwise typed label) and on annotation by S.P. Lynch in 1984 as Asclepias latifolia, also may belong instead to Asclepias eriocarpa. Tim Lowrey (pers. comm.), who is familiar with the sp. in New Mexico, remembers as a child plants possibly belonging to Asclepias latifolia occurring on dry washes near his family home near Rumsey (collection locality for UC449991). Final resolution will not occur at least until after a visit to the Rumsey area, planned for Spring of 2009, but until then it seems most judicious to treat this taxon as extirpated in California.
eFlora Treatment Author: Thomas J. Rosatti & Carol A. Hoffman
Jepson Online Interchange
Previous taxon: Asclepias fruticosa
Next taxon: Asclepias nyctaginifolia
Citation for this treatment: Thomas J. Rosatti & Carol A. Hoffman 2016. Asclepias latifolia, Revision 1, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=14392, accessed on May 31, 2016.
Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on May 31, 2016.