Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit the Jepson eFlora.



Edward F. Anderson (except Opuntia)

Perennial, shrub, tree, generally fleshy
Stem cylindric, spheric, or flat; surface smooth, tubercled, or ribbed (fluted); nodal areoles bear flowers, generally bear spines from center ("central spines") and margin ("radial spines") (Opuntia areoles bear small, barbed, deciduous bristles sometimes called glochids, generally also bear spines)
Leaf generally 0
Flower generally solitary, bisexual, sessile, ± radial; perianth parts generally many, grading from scale-like to petal-like; stamens many; ovary appearing inferior, ± submerged in stem, so generally with areoles on surface, style 1, stigma lobes generally many
Fruit generally fleshy, generally indehiscent, spiny, scaly, or smooth
Seeds many
Genera in family: 93 genera, ± 2000 species: especially Am deserts; many cultivated
Etymology: (Greek: thorny plant)
Reference: [Benson 1982 Cacti of US & Can; Hunt & Taylor eds 1990 Bradleya 8:85–107]



Stems 1–30, often in ± 1 m diam clumps, each 3–6 dm, 10–20 cm diam, spheric to columnar; ribs 13–21, prominent; tubercles indistinct; spines dense
Flower 4–5 cm diam; perianth yellow tinged with pink
Fruit dry, densely woolly
Seed 2–2.5 mm, 2–3.5 mm diam, black
Species in genus: 6 species: sw US, Mex
Etymology: (Greek: hedgehog cactus)


E. polycephalus Engelm. & J.M. Bigelow var. polycephalus

Stem < 1 m; central spines 4, 6–7.5 cm, red or yellow, canescent at first, spreading, lowermost curved slightly; radial spines 6–8, 3–4.5 cm, spreading, slightly curved, red or yellow
Flower: ovary densely woolly, with sharp-tapered bracts, style ± 20 mm
Chromosomes: 2n=22
Ecology: Rocky hills, silty valleys
Elevation: < 1000 m.
Bioregional distribution: eastern San Bernardino Mountains, Mojave Desert, n Sonoran Desert
Distribution outside California: to Arizona, Mexico
Flowering time: Mar–May
Horticultural information: DRN, DRY: 2, 3, 10, 11, 12, 13, 19 &SUN: 20, 21.

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bioregional map for ECHINOCACTUS%20polycephalus%20var.%20polycephalus being generated
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Echinocactus polycephalus var. polycephalus
Retrieve dichotomous key for Echinocactus
Overlay Consortium of California Herbaria specimen data by county on this map
Show other taxa with the same California distribution | Read about bioregions | Get lists of plants in a bioregion
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