Lobelia flexuosa (C. Presl) A. DC.

Heterotoma flexuosa (Presl) McVaugh, Bull. Torrey Club 67: 143. 1940.
Rapuntiujn flexuosum Presl, Prodr. Mon. Lob. 23. 1836.
Lobelia arabidoides H.& A. Bot. Beech. Vov. 301. pi. 66. 1838. (Beechey, Kew!)
Lobelia flexuosa A. DC. in DC. Prodr. 7; 379. 1839.
Heterotoma arabidioides Benth. in Hook. Ic. 12: 68. 1876.
Heterotoma intermedia Hemsl. Biol. Centr. Am. Bot. 2: 269. 1881. (Seemann 2051, Kew!)
Dortmannia mexicana Kuntze, Rev. Gen. 972. 1891. (Based on Rapuntium flexuosum Presl.)
In habit and vegetative characters very similar to H. cordifolia; cauline leaves linear to elliptic or oblanceolate, the tip usually blunt, the base narrowed to a margined petiole, the blades of upper and middle leaves 0.1-0.7 cm. wide by 3-8 cm. long, 5-15 times as long as wide, the margins shallowly dentate with callose teeth, or sinuate; basal rosette usually present, the leaves narrowly or broadly elliptic or rarely ovate, narrowed and blunt-pointed at tip, the base cuneate or rarely rounded, the petioles of basal leaves mostly 1-2 cm. long, the blades usually shorter and broader than the cauline, 1.5-6 times as long as wide, the margins regularly dentate; inflorescence few-18 cm. long, few-15-flowered, the peduncle (2) 5-10 cm. long; pedicels 17-45 mm. long in fruit; bracteoles as in //. cordifolia; flower-bracts linear, 3-6 (15) mm. long, the lowest, if leafy, linear and entire or essentially so; flower 7-9 mm. long, including hypanthium, the color unknown, apparently white; corolla glabrous, the tube 2.5-3.3 mm. long, the two lobes next the dorsal fissure 2-4 mm. long, the lobes of the lower lip 1.3-2.5 mm. wide by 3.0-4.5 mm. long; filament-tube 1.5-2.5 mm. long; anther-tube 1.0-1.3 mm. long; hypanthium in fruit and flower as in H. cordifolia, 1.7-2.5 mm. in diameter in fruit; spur and capsule as in H. cordifolia, the capsule 2.5-4 mm. long; calyx-lobes 1.5-3.0 mm. long; spur exceptionally as long as 2 mm., usually 1 mm. long or less; seeds as in H. cordifolia.
Type locality: Mexico, Th. Haenke (Praha!).
Distribution: Nayarit to Jalisco and Guerrero, at elevations up to about 1500 m.

Lobelia flexuosa là loài thực vật có hoa trong họ Hoa chuông. Loài này được (C.Presl) A.DC. mô tả khoa học đầu tiên năm 1839.