Flora of North America species comparison

monomorphic, without short axillary shoots.

dimorphic, with elongate primary and short axillary shoots.

of 2d-year stems brown or yellow-brown, glabrous.

of 2d-year stems gray, glabrous.

9-21-foliolate;

petioles 2-11 cm.

blade obovate to oblanceolate or almost elliptic, 1-veined from base, 2-6(-8) × 0.9-2.8 cm, thin and flexible, base short- to long-attenuate, margins plane, finely serrate, each with (8-)16-30 teeth 0-1 mm high tipped with spines or bristles to 0.6-1.4 × 0.1 mm, apex rounded or obtuse;

surfaces abaxially dull, smooth, adaxially dull, ± glaucous.

blades thin and ± flexible;

surfaces abaxially rather dull, smooth, adaxially dull, somewhat glaucous;

terminal leaflet stalked, blade 2.9-8.4 × 1.2-4.8 cm, 1.8-3.2 times as long as wide;

lateral leaflet blades lance-ovate to ovate, 4-6-veined from base, base rounded to cordate, margins plane, toothed, each with 6-13 teeth 1-2(-3) mm tipped with spines to 1-2.4 × 0.1-0.2 mm, apex acute or broadly acuminate.

absent.

present, simple or 3-fid.

racemose, dense, 30-70-flowered, 6-17 cm;

bracteoles membranous, apex acute, obtuse, or rounded.

racemose, lax, 10-20-flowered, 2-6 cm;

bracteoles membranous, apex acute.

anther filaments without distal pair of recurved lateral teeth.

anther filaments without distal pair of recurved lateral teeth.

blue, glaucous, oblong-ovoid or globose, 8-11 mm, juicy, solid.

red or purple, ellipsoid, 10-11 mm, juicy, solid.

scales (13-)20-44 mm, persistent.

scales 2-3 mm, deciduous.

= 56.