This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol3", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
A. amplexicaulis J. E. Smith, Georgia Insects 1:13. pl. 7. 1797.
A. obtusifolia Michx. Fl. Bor. Am. 1: 115. 1803.
Nearly glabrous, pale green, somewhat glaucous; stem stout, erect or ascending, 2°-3° high. Leaves sessile, oblong or ovate-oblong, obtuse and mucronulate at the apex, cordate-clasping at the base, 3'-5' long, 1' - 11/2' wide, margins wavy-crisped; umbels many-flowered, usually solitary on the long terminal peduncle, rarely with a second shorter-peduncled one at its base; pedicels slender, downy, about 1' long; corolla-segments oblong, greenish-purple, about 4" long; column thick; hoods pink, nearly truncate and toothed at the summit, shorter than the subulate incurved horn, longer than the anthers; follicles erect on the stout decurved fruiting pedicels, downy, 4'-6' long.
A. intermedia Vail, Bull. Torr. Club 31: 459. 1904.
Stem erect, glabrous, purplish, not glaucous, about l° high. Leaves oblong-elliptic, glabrous above, minutely pubescent beneath, 6' long or less, obtuse at both ends or the upper subcordate at the base, the petioles very short; umbels 2 or more, terminal, pe-duncled, the peduncles and slender pedicels pubescent; corolla green-purple, its oblong-lanceolate segments 3"-4" long, the erect hoods ovate-lanceolate, obtuse, about 3" long, pink-purple, with a darker stripe on the back, the margins with an erect tooth above the middle, the horn slender.
Lawrence, Long Island. Possibly a hybrid between A. syriaca and A. amplexicaulis.
A. Meadii Torr.; A. Grav. Man. Ed. 2, Add. 704. 1856.
Nearly glabrous throughout, pale green or glaucous; stem simple, or rarely branched above, 1°-2° high. Leaves opposite, sessile, flat, mostly distant, ovate, ovate-lanceolate, lanceolate or the lower oblong, acute or sometimes obtuse at the apex, the margins scabrous; umbel solitary, terminal, several-flowered, borne on a peduncle 3'-6' long; corolla-segments greenish, ovate, acute, 2"-4" long; column very short, thicker than high; hoods ovate, purplish, nearly twice as long as the anthers, rounded and truncate at the summit, longer than the subulate inflexed horn, with a small tooth at each side on the inner infolded margin; follicles erect on decurved pedicels, minutely puberulent, narrow, 4-5' long.
In dry soil, Illinois to Iowa and Wisconsin. June-Aug.