13. A. variegàta, L. Stem 1–2° high; leaves (4–5 pairs) ovate, oval, or obovate, somewhat wavy, contracted into short petioles, middle ones sometimes whorled; pedicels (numerous and crowded) and peduncle short, downy; divisions of the corolla ovate (white); hoods orbicular, entire, purplish or reddish, the horn semilunar with a horizontal point.—Dry woods, southern N. Y. to Ind., south to Fla., Ark., and W. La. July.—Remarkable for its compact umbels of nearly white flowers.
b. Leaves mostly pubescent or puberulent; hoods obtuse, entire, twice or thrice the length of the anthers.
14. A. ovalifòlia, Decaisne. Low (6–18´ high), soft-downy, especially the lower surface of the ovate or lanceolate-oblong acute short-petioled leaves (1½–3´ long); umbels loosely 10–18-flowered, sessile or peduncled; pedicels slender, hoods oblong, yellowish, with a small horn, about the length of the oval greenish-white corolla-lobes (tinged with purple outside).—Prairies and oak-openings, N. Ill. and Iowa, to Wisc. and Dak.
[++][++] Follicles and pedicels erect; leaves often whorled; glabrous or nearly so.
[=] Leaves ovate to broadly lanceolate, thin, rather slender-petioled.
15. A. quadrifòlia, L. Stem slender (1–2° high), mostly leafless below, bearing usually one or two whorls of four in the middle and one or two pairs of ovate or ovate-lanceolate taper-pointed petioled leaves (2–4´ long); pedicels slender; corolla-lobes (pale pink) oblong; hoods white, elliptical-ovate, the incurved horn short and thick.—Dry woods and hills, N. Eng. to Minn., south to N. C. and Ark.
16. A. perénnis, Walt. Stems (1–2° high) persistent or somewhat woody at the base; leaves lanceolate or lanceolate-ovate, tapering to both ends, thin, rather slender-petioled; flowers white, small; the small hoods of the crown shorter than the needle-shaped horn; seeds sometimes destitute of a coma!—Low grounds, S. Ind. and Ill. to Tex., and eastward.
[=][=] Leaves narrowly linear to filiform; horn subulate, exserted; column conspicuous.
17. A. verticillàta, L. Stems slender, simple or sparingly branched, very leafy to the summit, leaves filiform-linear, with revolute margins (2–3´ long, 1´´ wide), 3–6 in a whorl; umbels small, lateral and terminal; divisions of the corolla ovate (greenish-white); hoods roundish-oval, about half the length of the incurved claw-shaped horns.—Dry hills, common, especially southward.—Var. pùmila, Gray, is low and many-stemmed from a fascicled root; leaves much crowded, filiform.—Dry plains, Neb. to Kan. and N. Mex.
§ 2. Anther-wings broadly rounded at base and conspicuously auriculate-notched just above it; hoods with a minute horn exserted from the 2-lobed apex.