Flora of North America species comparison

spreading, yellow to yellow-brown [gray], much-branched, woody-succulent, glabrous; short shoots common;

latex watery, yellow in young shoots, red in older shoots.

spreading, reddish brown (when actively growing) or red to dark red or grayish (when dormant), much-branched, rubbery-succulent, glabrous; short shoots common;

latex watery, colorless to cloudy-whitish in fast growing shoots, blood red in basal portion of older shoots and rhizomes.

deciduous, usually fascicled on short shoots;

stipules absent;

petiole 0(–0.2) cm, not stipitate-glandular;

blade obovate-spatulate, 0.7–1.9 × 0.3–0.9 cm, unlobed (shallowly 3-lobed on active shoots), base attenuate, margins entire, apex usually rounded, sometimes emarginate, coriaceous, surfaces glabrous;

venation pinnate (palmate if lobed).

deciduous, fascicled on short shoots;

stipules deciduous, linear, 1–2 mm, undivided;

petiole 0–0.2 cm, not stipitate-glandular;

blade linear-spatulate to narrowly obovate, 1.5–5(–7) × 0.2–0.7 cm, usually unlobed, sometimes shallowly, rarely deeply, 3-lobed, base attenuate, margins entire, apex rounded, membranous, surfaces glabrous;

venation pinnate (palmate if lobed).

on short shoots, cymes or flowers solitary;

peduncle 0.4–0.6 cm;

bracts 0.4–1 mm, margins entire, glabrous.

terminal or axillary, fascicles;

peduncle absent;

bracts absent.

1–4(–6.5) mm.

1–2.5 mm.

sepals connate basally, ovate-lanceolate, 2.5–4 × 0.6–1 mm, margins entire, apex acute, surfaces glabrous;

corolla white, tubular-urceolate, petals connate most of length, 4–6 × 1.3–2 mm, surfaces glabrous;

stamens 10 in 2 whorls (5 + 5);

filaments of both whorls connate almost to top, outer whorl 1–2.5 mm, inner series 2.5–4 mm.

sepals distinct or connate basally, ovate to elliptic-lanceolate, 2.5–3 × 1.2–1.4 mm, margins entire, apex acute, abaxial surface hairy, adaxial glabrous;

corolla white to pinkish white, urceolate-tubular, petals connate most of length, 5–6 × 1.4–1.5 mm, abaxial surface sparsely puberulent abaxially, adaxial glabrous;

stamens 10 in 2 whorls (5 + 5);

filaments of both whorls connate from 1/5–3/4+ length, outer whorl 2–3 mm, inner whorl 3–5 mm.

resembling staminate, but sepals distinct, 1.5–3 × 0.5–1 mm;

petals 4–4.5 × 1–1.5 mm;

carpel 1;

styles 0.5–1 mm.

resembling staminate;

carpel 1;

style 2.5–3 mm.

spheric, 0.9–1.1 × 0.9–1.1 cm, tardily dehiscent.

ellipsoidal, 1.2–1.4 × 1.1–1.3 cm, tardily dehiscent.

solid dark to golden brown, spheric, 10 × 10 mm;

caruncle absent.

solid gray-brown, spheric, 12 mm diam.;

caruncle rudimentary.

= 44 (Mexico).

= 44.