Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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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]



Stem generally 1, < 3 m, 20–35 cm diam, depressed-spheric to columnar; ribs 15–27; tubercles inconspicuous; spines dense
Flower 3–6 cm diam; tube poorly developed; ring of hairs separating perianth and stamens; ovary densely scaly
Fruit 1–2 cm diam, scaly, generally yellow, opening by a pore near base
Seed 1.5–3 mm, black, pitted; scar basal
Species in genus: 23 species: sw US, Mex
Etymology: (Latin: fierce cactus)
Reference: [Taylor 1984 Bradleya 2:19–38]


F. cylindraceus (Engelm.) Orcutt


Stem 10–30 dm, generally taller than wide, spheric or columnar; ribs 18–27; spines 10–18, erect and spreading, longest recurved, generally with some red, becoming gray
Flower: perianth parts yellow with red base; ovary 9–12 mm, scales fringed, style 12–20 mm
Fruit yellow
Seed 1–3 mm
Chromosomes: 2n=22
Ecology: UNCOMMON. Gravelly, rocky, or sandy areas
Elevation: 60–1500 m.
Bioregional distribution: Desert (especially e Mojave Desert, w Sonoran Desert)
Distribution outside California: to Utah, Mexico
Synonyms: Echinocactus c. Engelm.; F. acanthodes (Lem.) Britton & Rose misapplied (rejected name)
Threatened by collecting; monitoring needed.

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bioregional map for FEROCACTUS%20cylindraceus 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 Ferocactus cylindraceus
Retrieve dichotomous key for Ferocactus
Overlay Consortium of California Herbaria specimen data by county on this map
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