Lobelia macrocentron (Benth.) T. J. Ayers

Heterotoma macrocentron Benth. in Hook. Ic. 12 : 68 pi. 1177. 1876.
Stems decumbent or trailing, few-branched, up to I.O mm. in diameter at base, purjile at least below, few-20 cm. long, hirsute below the inflorescence with sharp spreading lightcolored hairs; leaves cauline, few-20, sparsely hairy above and beneath with hairs like those of the stem, often purplish, the blades ovate to orbicular or reniform, cordate at base, rounded or bluntly angled at tip, their size very variable, 2-25 mm. long and wide, on a slender petiole up to 2 cm. long, the margins varying from subentire, with minute callose teeth, to sharply serrate with about 6-8 teeth per cm. ; flowers 1-6, in a corymbiform raceme, the lowest pedicels sometimes elongating and surpassing the unopened buds; inflorescence sometimes appearing stalked, the stem naked below it as much as 5 cm.; pedicels filiform, strongly ascending, 12-50 mm. long in flower, smooth and glabrous or hairy near base, ebracteolate; flower-bracts narrower than the leaves, 1-2 mm. wide, .3-5 mm. long; flower 15 mm. long, measured from tips of corolla-loljcs to base of hypanthium; corolla purplish (?^not seen fresh), glabrous, the tube 5.5-6.0 mm. long, entire except for the dorsal fis,sure, the two upper lobes 1.0-1.5 mm. broad, 4-6 mm. long, the three lower lobes about 2.5 mm. broad, 5-7 mm. long; filament-tube 5.05.5 mm. long, glabrous, the filaments connate near apex or nearly half their length; anthertube 1.8-1.9 mm. long, the two smaller anthers white-tufted at tips; all anthers pubescent on the backs; hypanthium in anthesis turbinate, glabrous, about 3 mm. long, one-sided, the lower part and the two lower lobes prolonged backward into the spur; spur linear, 4-7.5 mm. lonx, straight or somewhat arcuate, nearly paralleling the pedicel or diverging from it; fruit not seen; calyx-lobes linear, acute, entire, 3-5 mm. long, smooth and glabrous, the two lower ones slightly shorter, less than 1 mm. from the distal end of the spur; seeds not seen.
Typk l/KALin': "Sierra Ma<lrc, north-west of Mexico" (prohalily t)Ctwccn MiizatlAn, Siiiulou, anil the city of IhjranKo). .Seemnnn 204'J (Kew!).
I>i»T«im;TioN: Western Chihuahua; "northwestern Mexico."