[Vor. 11 
188 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
Specimens examined: 
Chile: Quillota, without date or collector (G). 
Argentine Republic: General Roca and vicinity, Rio Negro Valley, 
750-1100 ft. alt., 19 Jan., 1915, Fischer 266 (U. S., Cornell, 
and M). 
This plant is closely related to M. glabratus and may be only 
а pubescent, short-pedicelled form of that species. 
25. M. glabratus HBK. Nov. Gen. & Sp. 2: 370. 1817; 
Benth. Seroph. Ind. 28. 1835; DC. Prodr. 10: 371. 1846; Gray 
in Bot. Mex. Bound. 116. 1859; Syn. Fl. ЇЧ. Am. ed. 2, 2: 
Suppl. 447. 1886; Conzatti & Smith, Fl. Sin. Mex. 117. 1897. 
M. andicolus HBK. Nov. Gen. & Sp. 2: 370. 1817. 
M. Jamesii var. texensis Gray, Syn. Fl. №. Am. 21: 277. 1878, 
and ed. 2, 1886; Greene in Bull. Calif. Acad. Sci. 1: 118. 1885. 
M. tener Phil. in Anal. Mus. Nac. Chile 1: 70. 1891; Reiche, 
Fl. Chile 61: 64. 1911. i 
A low perennial, glabrous or nearly so, aquatic or semi, 
aquatic, stoloniferous or with creeping stems which root freely at 
the lower nodes; stems usually numerous, hollow, weak, 1-4 em. 
long; leaves broadly ovate, 1.5-5 cm. long, .8-3 em. broad, 
irregularly dentate, sometimes shallowly lobed at the base, 3-5- 
nerved, basal leaves cuneate, subcordate or with margin 
petioles, these usually shorter than the blade, upper leaves 
subcordate, sessile; flowers axillary, chiefly along the upper parts 
of the stem, pedicels slender, nearly filiform in some specimens, 
longer or shorter than the leaves; calyx campanulate, often spotted 
or tinged with red, 5-8 mm. long, broadly oval in fruit, 1-12 
em. long, teeth broad, spreading, very short, the upper tooth 20: 
more times longer than the others, all broadly rounded, some 
times mucronate, the apex appearing acute only when folded, 
throat little, if at all, constricted; corolla tubular, .7-1.5 em. long, 
tube slender, lower lip heavily bearded, middle lobe much longer 
than the lateral ones; style glabrous; capsule oblong, rounded, 
constricted at the base, not stipitate, shorter than the ому 
tube; seeds oval, longitudinally striate. 
Distribution: in shallow water or muddy places; the sem 
floating or creeping and more or less procumbent. Oklahoma 10 
Bolivia. 
