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Opuntiahumifusa (Rafinesque) Rafinesque. Spineless Eastern Prickly Pear. Phen: May-Jun; Aug-Dec. Hab: Slate outcrops, sandy soils, upland hardwood forests or mixed pine-hardwood forests in dry, clay or silty soils. Dist:O. humifusa is restricted primarily to the Appalachian Mountains and mid-Atlantic Coastal Plain, but also occurs in the inner Coastal Plain of c. and nc. MS (Attala, Choctaw, Grenada, Webster cos.).
Origin/Endemic status: Endemic
Taxonomy Comments: More work may illuminate populations in n. AL, nw. GA, w. SC, w. NC, and ne. TN, however, at present populations are disjunct between the eastern states (DE, MD, NJ, VA, WV) and MS. O. humifusa is an allotetraploid (2n=44), cryptic species that is most easily confused with O. mesacantha ssp. mesacantha, from which it can be separated by its lack of spines (although see O. mesacantha), and generally increased number of areoles per diagonal row across the cladode face at midstem (4-5 vs. 3-4 in O. mesacantha), generally inserted glochids (vs. exserted in O. mesacantha), and smaller seeds (4.0-4.6 mm long vs. 5.0-5.9 mm long in O. mesacantha ssp. mesacantha) with a smooth funicular envelop (instead of the upraised funicular envelope in O. mesacantha ssp. mesacantha). Opuntia humifusa also tends to have rotund or elliptic-oblong cladodes vs. O. mesacantha ssp. mesacantha, which more often has rotund to obovate cladodes, but cladode shape is highly variable. Populations of O. humifusa are typically located geographically between populations of O. cespitosa and O. mesacantha ssp. mesacantha. See Kalmbacher (1976) and Leuenberger (1993) for a discussion of the proper name for this taxon.
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Horticultural Information
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Height:to 2 feet or more
plant sale text:The waxy yellow 3-to-4-inch flowers on this native cactus provide nectar for butterflies. The Eastern Prickly-pear has large purple to reddish-brown berry-type fruits that are a fine source of food for wildlife. It makes an unusual accent plant. This species was used by several Native American tribes as a dermatological aid, as well as eating the fruits once the spines were removed. This species is drought-resistant and easy to grow. Because of its spines, be sure to plant it where it will have ample room to grow. A mature clump will reach 3 or 4 feet in width.
