Flora of North America species comparison

long-shoot internodes 4–22 mm, sericeous-villous to hirsute-pilose, rarely glabrous, glabrescent; short shoots (1–)2–55 × 1–3.4 mm.

long-shoot internodes 10–17 mm, sparsely villous, sericeous, or hirsute; short shoots 1–15 × 1.7–3 mm.

persistent or ± drought-deciduous;

stipules 1–3.8 mm;

petiole 0.4–6 mm;

blade linear, linear-lanceolate, lanceolate, lance-elliptic, or elliptic-ovate, (3–)5–48 × 1–11 mm, stiffly coriaceous, base cuneate, margins weakly to strongly revolute, entire, thickened, apex acute, apiculate-mucronate to obtuse-rounded, abaxial surface initially sericeous or villous (sometimes strongly so), sometimes glabrescent, areoles closely canescent, adaxial sericeous, hirsute, or villous, glabrescent.

petiole (1.5–)2–4.5 mm;

blade narrowly lanceolate to linear, sometimes lance-elliptic, (7–)13–29(–48) × (1.5–)2–5(–7) mm, margins revolute (leaving much of abaxial surface exposed), abaxial surface usually densely villous, sometimes sericeous, adaxial usually moderately, often loosely, villous or sericeous, rarely pilose, usually glabrescent.

1–10 per short shoot;

hypanthial tubes densely to loosely sericeous, villous, or with indument of coiled ascending hairs;

hypanthial cups 1.5–3 × 1.8–3.5 mm;

sepals (3–)5, broadly deltate, 1–2.5 mm, acute-obtuse;

stamens 10–25, anthers 0.7–1.2 mm, glabrous.

1–5 per short shoot;

hypanthial tubes strongly villous;

sepals 2–2.5 mm.

6–10.5 × 0.8–1.5 mm; fruiting pedicels 0.3–1.5(–2) mm;

hypanthial tubes (2.6–)3–11 mm;

pedicel/tube ratio (5–)8–18(–28)%;

fruit awns 3–8.5 cm, proximal setae 1.6–3.5 mm.

6.5–9 × 1.2–1.4 mm;

fruit awns 4–7.5 cm, proximal setae 1.6–2.7 mm.