Heterotoma lobelioides Zucc.

Heterotoma lobelioides Zucc. Flora 15-: Beibl. 101. 1832
Lobelia caUarata Bcrtol. Nov. Comm. Bonon. 4: 409. 1840. (Type from Guatemala.)
Stem erect, simple or branched, somewhat woody at base (maximum diameter about 7 mm.), green, or rough and brownish below, 0,3-2.0 m. high, pubescent throughout or Ijclow only, rarely nearly glabrous; leaves cauline, spreading, few-20, thin and papery, the blades 3-9.5 cjn. wide by 6-15 cm. long, ovate, the tip long-acuminate, the base rounded or cordate, the petiole 3-7 (9.5) cm. long, the pubescence usually dense on petiole and on veins of the lower surface and sparse elsewhere, the margins varying from rcpand-denticulate with 2-7 callose teeth per cm., to coarsely serrate with spreading teeth as much as 7 mm. long; inflorescence not sccund, 7-20 (40) cm. long, on a peduncle 5-19 cm. long, loosely 10-30(50-) flowered; pedicels ascending or the lower spreading at right angles to the stem, slender (the maximum diameter about 1 mm.), 25-70 mm. long in fruit, smooth and glabrous or somewhat ciliatc, ebracteolate or with a pair of filiform bracteoles 2-4 mm. long at or near base; flowerbracts mostly linear, the lowest about I mm. wide, 5-13 mm. long, ciliale, denticulate, the lowest rarely broader, leafy; all bracts exceptionally ovale, leafy; flower 24-30 mm. long (measured from ajjcx of pedicel to tips of longest corolla-lobes) ; corolla glabrous, or puberulent without, red or yellow, or particolored, the spur blood-red to dull rose (according to collectors) and the lol>es and upper corolla-lube yellow, the tube 16-18 nmi, long, fenestrate laterally, the two upiier lobes slightly recurved, narrowly triangular or lanceolate, allcnuatc, about I mm. wide, .5-8 mm. long, the three lower lobes fused into a (very slightly recurved) liji slightly shorter than the two upper lobes; lower lobes free about 1.5-2 mm., triangular; filament-tube 13-17 mm. long, deflexed and exserted from the corolla, glabrous, the filaments connate about half their length; anther-tube (3.5) 4.0-5.0 mm. long, yellow, the two smaller anthers conspicuously yellow-tufted at tip, the three larger smooth or ciliate; hypanlhium unilaterally campanulate, the lower side, with the two lobes opposite the short anthers, prolonged at right angles to the pedicel into the spur; hypanthium-tube pubescent or less often glabrous, in fruit 3.5-5.5 mm. in diameter; spur 14-25 mm. long (measured from the base of the hypanthium), consisting of the linear elongation of the hypanthiura and a conic, somewhat inflated portion of the corolla which is about 4-6 mm. in diameter at base; capsule about threefourths inferior, 8-9 mm. long; calyx-lobes (1.5) 2-4.5 (6) mm. long, entire, ciliate or nearly glabrous, narrowly triangular, the two lower ones at or near the tip of the spur, at right angles to the spur or pointing backward, mostly slightly shorter than the other three; seeds ellipsoidfusiform, smooth, somewhat lustrous, about 0.5 mm. in length, with faint longitudinal markings as seen with a magnification of about 20 diameters.
Tyfe locality: "La Cumbre de San Antonio, 8000 pedes supra oceammi."
Distribution: Costa Rica to San Luis Potosl and Michcacan, at elevations of 1500-3000 m.