Lobelia cordifolia Hook. & Arn.

Heterotoma cordifolia (H. & A.) McVaugh, Bull. Torrey Club 67: 143. 1940.
Lobelia cordifolia H. & A. Bot. Beech. Voy. 301. 1838.
Heterotoma tenella Turcz. Bull. Soc. Nat. Mosc. 25^ (No. 3): 175. 1852. (Type from Vera Cruz,
Galeotti.) Heterotoma gibbosa S. Wats. Proc. Am. Acad. 23: 280. 1888. (Pringle 1478, Gray!) Heterotoma Endlichii F. E. Wimmer, Repert. Sp. Nov. 20: 1. pi. 71, f. 1. 1929. (Endlich 1172,
1172a, Berlin.)
Stem erect, simple or with few-many ascending subordinate branches, up to 3 mm. in diameter at base, green, or purplish below, few-55 cm. high, pubescent below the inflorescence with soft sharp whitish hairs or exceptionally nearly glabrous; cauline leaves few10, spreading, thin and papery, smooth above or sparsely strigose, the lower surface bristly-pubescent at least on the veins, the blades ovate to suborbicular or reniform, cordate or rounded at base, mostly 1-3 cm. broad by 1.5-3 (5) cm. long, about as broad as long, the lower ones smaller, the middle and upper leaves usually acute at tip, with incised-serrate margins, sometimes palmately lobed or cleft, the lower leaves obtuse or rounded at tip, varying to acute, the margins sinuate or subentire, seldom serrate; petioles slender, 1-1.5 (2.5) cm. long; venation of blades often appearing palmate; lower internodes sometimes approximate, the leaves appearing as a basal rosette; inflorescence mostly strongly secund, few-25 cm. long, few-20-flowered, appearing pedunculate for a distance of 4-7 cm.; pedicels filiform, (6) 15-30 (35) mm. long in fruit, smooth and glabrous, straight or somewhat arcuate, the mature capsule often strongly incurved by an abrupt bend at the very end of the pedicel, which is ebracteolate or with a pair of filiform bracteoles 1.5 mm. long or less at or near the base, these often present on pedicels of lowest flowers only; flower-bracts linear, entire, glabrous or ciliate on the margins, 2-6 mm. long, the lowest sometimes leafy, incised-toothed; flower 5-9 mm. long, including hypanthium; corolla white or pale bluish lavender, glabrous, the tube 2.0-2.7 (3.5) mm. long, entire except for the dorsal fissure, which extends to a point about 0.5 mm. from the base, the two lobes next the dorsal fissure linear or narrowly elliptic, with triangular base, 1.8-3 mm. long, the lobes of the lower lip elhptic to obovate, 1-2 mm. wide by 2-3.5 mm. long; filament-tube 1.62.5 (3) mm. long, glabrous, the filaments couiate about half their length; anther-tube 0.6-1.3 mm. long, the two shorter anthers white-tufted at tip, the three larger ones smooth or pubescent; hypanthium in anthesis ellipsoid, glabrous, in fruit elUpsoid or cup-shaped, longer than broad, (1.5) 2.0-2.5 (3) mm. in diameter; spur conic, in flower 1 mm. long or less (only exceptionally longer), in fruit appearing as a small projection at or below the middle of the strongly asymmetrical hypanthium (rarely entirely lacking and the hj-panthium regular); capsule usually about three-foturths inferior (measured on the long side of the hypanthium-tube), 3.5-5.5 mm. long; cal-x-lobes narrowly triangular or nearly linear, usually with a slightly dilated base, smooth and glabrous or with a few marginal cilia, 1.5-3 (4) mm. long; seeds light brown, about 0.5 mm. in length.
Type locauitv: Western Mexico (vicinity of Tepic, Nayarit), Beeckey (Kew!). Distribution; Chihuahua and southern Sonera to Jalisco and Vera Cruz, southward to Costa Rica, at elevations up to about 2000 m.

Lobelia cordifolia là loài thực vật có hoa trong họ Hoa chuông. Loài này được Hook. & Arn. mô tả khoa học đầu tiên năm 1838.