252 New Species of Mexican Plants. [ZOE 
ore annulare pilis vel squamis fimbriatis, interiore squamis quad- 
ratis carnosis; tubo stamineo 2 mm. longo; stigmate apice um- 
bonato; polliniis fere horizontalibus. Folliculi ignoti. 
Stems hirsute with long, spreading, bristly, fulvous hairs; 
leaves tawny-hirsute on both faces; petioles densely hirsute. 
Crown of ten fleshy, quadrate scales, about 1 mm. high, attached 
to the base of the column and on the outer side furnished with 
numerous, yellowish hairs or fimbriate appendages longer than 
the scales themselves and forming a conspicuous ring within the 
corolla. Collected at Zacuapan. No. 2007 
Microdactylon, gen. nov. Calyx 5-partitus, basi intus 
5-glandulosus. Corolla campanulato-subrotata, alte 5—fida, lobis 
latis contortis dextrorsum obtengentibus. Coronz squame 5, 
tubo stamineo affixe, erectz, in ligulos 4-5 antheras superantas 
producte. Stamina basi corolle affixa, filamentis in tubuin con- 
natis; antherze sub sinubus breves, subtransversim dehiscentes. 
Pollinia in quoque loculo solitaria, obovata, inter stigmatis angu- 
los introrsum spectantia. Stigma vertice depressum. Frutex 
scandens affinis Gonolobo et Microstelme. 
Microdactylon cordatum. Caules ramosissimi fruticosi, juve- 
nilibus pubescentibus pilis intermixtis: foliis oppositis oblongo- 
ovatis acuminatis, basi profunde cordatis, utrinque pubescenti- 
bus, petiolo excludente 3-4 cm. longis, 2-2.3 cm. latis; petiolis 
1.5-2 cm. longis: cymis 1-4-floris; pedunculis pubescentibus 
2-3.5 cm. longis; pedicellis 1-2 cm. longis: calycis segmentis 
ovato-lanceolatis pubescentibus, 6 mm. longis: corollis atro-pur- 
pureis, tubo 3 mm. longo glabro, lobis 7 mm. longis, intus longe 
cinereo-pilosis. Folliculi ignoti 
No species seems to have been described in the genus Micro- 
stelma. ‘The specimens indicate a plant with stems at least 1 m. 
ong. The ash-colored woody stems are 3-4 mm. in diameter, 
and the numerous short branches usually bear the cymes from 
the leaf axils. The flower differs from that of Gonolobus in the 
construction and attachment of the corona. The staminal col- 
umn is 2-3 mm. long, and the laterally compressed scales of the 
corona are attached nearly its whole length; they are about 
2 mm. wide at the fleshy-thickened top near the anthers, and then 
