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margins entire, apex obtuse or acute to acuminate; surfaces abaxially chalky white or green to glaucous, pubescent or glabrous. Flowers protogynous, appearing

branches dark-brown to chalky white, smooth, often exfoliating; lenticels dark, prominent, sometimes horizontally expanded. Wood nearly white to reddish-brown

at first, exfoliating in thin plates, exposing conspicuous mosaic of chalky white to buff or greenish new bark, becoming dark, thick, and fissured with

3–8 (–10) × 1–7 (–10) mm; wool white, gray, or tan to brown, aging white or gray to black. Spines 0–15+ per areole, white, yellow to brown, redbrown to

attenuate at base, stipelike base 0.1–3 mm; perianth various shades of white, cream, yellow, pink, or reddish, glabrous or pubescent abaxially, glabrous

cordate or auriculate, apex acute to short-acuminate; surfaces abaxially chalky white or pale green to glaucous, pilose, adaxially deep green, glabrous. Flowers

multistemmed, 10–15 (–20) m; bark green with paler greenish white vertical stripes, becoming gray or chalky white, smooth. Leaves: petiole 15–30 (–40) cm; blade palmately

than wide. Spines (0–) 1–5 (–12) per areole, absent or at most areoles, chalky white, yellow when wetted, aging gray to black, usually with redbrown extreme

auriculate, apex acute to short-acuminate or obtuse; surfaces abaxially chalky white, sometimes pale green to glaucous, pilose, adaxially deep green, glabrous

smaller. Involucres 10–12.5+ mm. Phyllaries (chalky white) ± ovate, midvein wings highest at bases. Corollas white, rarely tinged with pink, 9–10.5 mm. Cypselae

trunks and branches dark reddish-brown, smooth, in maturity creamy to chalky white or pale to (infrequently) dark-brown, readily exfoliating in paper-thin

wool yellowish white. Spines (1–) 5–15 per areole, mostly in distal areoles, 3–5 cm; major 1–3 abaxial spines deflexed, usually chalky white (at least adaxially)

rosettes solitary, not in clumps, 10–35-leaved, 5–30 (–60) cm diam.; blade ± chalky white, in age often red, oblong to oblong-obovate, 3–17 [–30] × 1–7 cm, 2–4

from near middle in fruit; rosettes solitary, 5–60 cm diam., blade often chalky white. > 2 2 Caudices 1–4 cm diam.; rosettes 10–35-leaved, blade apices acute

obtuse to acute or rounded to somewhat acuminate; surfaces abaxially chalky white to glaucous, glabrous or densely silky-pubescent, adaxially dull green

glabrous or pubescent, adaxial glabrous; sepals triangular, 0.5–1 mm; petals chalky white to pink, orbiculate, 1.3–1.5 mm; staminodes 5–15 reduced to serrations;

age; wool gray. Spines 4–11 per areole, in most areoles, yellow with chalky white coat, to yellow with redbrown basal portions, aging reddish gray; erect

× 4–6 mm; wool tawny, aging blackish. Spines (0–) 1–6 (–12) per areole, white to yellow, usually red to dark-brown at extreme bases, aging gray to ± black

mm. Flowers 2.5–3.5 mm, including 0.2–0.4 mm stipelike base; perianth chalky white, glabrous; tepals monomorphic, oblong to narrowly obovate; stamens exserted

ovate-triangular, or ovate; petals 5, greenish, yellowish, chalky, or translucent white, white, pink [rose], or purple, ovate to obovate, suborbiculate,

rosettes solitary, not in clumps, 30–80-leaved, 25–60 cm diam.; blade chalky white, oblong to oblong-oblanceolate, widest at base or in distal 1/3, 8–25

over distal 0–70% of stem segment, spreading to reflexed, yellow with chalky white coat and brown to yellow basal portions, aging dark red, straight, subulate

usually straight, acicular, terete, 25–35 mm; 1–2 smaller spines deflexed, chalky white, to 10 mm; 0–4 additional very small spines. Glochids in bushy crescent

bright-yellow to orange, redbrown at extreme base, aging tan to blackish, not chalky white, acicular; major spines (1–) 3–5 (–6) per areole, sometimes flattened

sometimes spiny; areoles bearing conspicuous tuft of long, white to tan wool. Seeds yellowish white or pale-yellow to brownish, suborbicular (to rectangular)

jamaicensis, the minute black plants contrasting starkly with the usually chalky white rock surface. The somewhat elevated cells on the adaxial surface of the

in shaded canyon sites on fine-textured red sandstones, clays, gypsum, chalky white degraded limestone or limestone in pinyon-juniper woodland to ponderosa

elevations on rocky, lime­stone sites or at lower elevations on extreme, chalky, white limestone and dolomite substrates or sometimes scree slopes. A more common

3 m. Leaves erect, yellow-green, to 45 cm, covered with conspicuous, white, chalky powder, especially toward base; sheath pale, elliptic; blade triangular

15–50-flowered, erect to pendulous; corolla white, diurnal. > 2 2 Leaves yellow-green, covered with conspicuous, white, chalky powder; floral bracts 6–8 mm Catopsis

to spreading, bright green, 20–40 cm, not covered with conspicuous, white, chalky powder; sheath pale or slightly darkened toward base, elliptic; blade

hotsprings, quartzite gravel, barren areas with shale and chalky soil, gravelly hillsides, white calcareous soils Elevation: 1500-2200 m Generated Map Legacy

internodes glabrous, distal portions of the lower internodes with a thick, white, chalky bloom. Ligules 0.1-0.2 mm, of hairs; blades 1-4 (7) cm long, 0.5-2 mm

nodes usually 4-5; lower internodes glabrous, without a conspicuous, white, chalky bloom. Ligules 0.1-0.2 mm, of hairs; blades 2-7 cm long, 1-2 mm wide

snowy white or, if ± pigmented (in some populations especially on igneous rock), then central spines tan, stramineous, golden yellow, pale chalky pink,

2–4 spines reflexed, shorter, to 20 mm; adaxial 1–2 spines yellow or white chalky with brown basal portions, 25–50 mm. Glochids in moderately dense crescent

light-brown, 2–2.5 mm, glabrous. Phenology: Flowering Jun–Sep. Habitat: White, chalky slopes, saltbush communities Elevation: 1300-1400 m Generated Map Legacy

glands absent. Spines 23–30 per areole, pale tan to grayish white, largest spines often tipped “chalky” or “dusty” blue-gray and brown; radial spines 19–26 per

absent. Spines (33–) 43–60 per areole, white to gray, tan, or pale reddish (central spines with darker, usually chalky blue tips), glabrous; radial spines

the veins not excurrent. > 22 22 Lower culm internodes with a thick, white, chalky bloom distally; panicle branches stramineous, mostly appressed, usually

or glabrous; teeth 5, erect, 0.3–0.6 mm. Flowers 2–2.5 (–3) mm; perianth white, becoming rose, glabrous; tepals connate proximal 1/4, essentially monomorphic

with red, 22–46 mm; petals yellow to pale-yellow, fading pale yellowish white, very broadly obcordate or obovate, (25–) 30–45 mm; filaments 18–27 mm, anthers