Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
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CACTACEAE

CACTUS FAMILY

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]

MAMMILLARIA

NIPPLE CACTUS, FISH-HOOK CACTUS


Stems 1–many, 2–30 cm, 2–20 cm diam, spheric to cylindric; ribs inconspicuous; tubercles round in X -section; central spines generally hooked
Flower 1–5 cm diam; ovary glabrous
Fruit ovoid to cylindric, red, glabrous
Seed black, pitted
Species in genus: 150 species: North America
Etymology: (Latin: nipple)
Reference: [Hunt 1984–87 Bradleya 2:65–96; 3:53–66; 5:17–48]

Native

M. dioica K. Brandegee

Plant with either all bisexual or all pistillate flowers
Stem generally 1(–many), 5–30 cm, 3–7 cm diam; bristles present in axils of tubercles; central spines 1–4, 8–15 mm; radial spines 11–22 in 1 rank, 4–10 mm, white
Flower 10–22 mm, 20–40 mm diam; perianth yellow to white
Fruit 10–25 mm, club-shaped to ovoid
Seed: aril 0
Chromosomes: 2n=44,66
Ecology: Hillsides, washes, coastal scrub to creosote-bush scrub
Elevation: 10–1500 m.
Bioregional distribution: South Coast, w edge Sonoran Desert
Distribution outside California: Baja California
Flowering time: Feb–Apr
Synonyms: var. incerta (Parish) Munz
Horticultural information: DRN, DRY: 17, 19, 20, 21, 22, 23, 24.

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