20 NORTH AMERICAN FLORA [VOLUME 32 
lowest leaves elliptic, 6-20 mm. long, 1—2.5 mm. wide, rounded at the apex, gradually attenuate 
to the base; flowers partly sessile or short-pedicellate in the forks of the branches, partly in 
lax few-flowered pedunculate axillary cymes; hypanthium less than 1 mm. long, the calyx- 
lobes as long or slightly longer, thick, narrowly oblong or lance-oblong, obtuse or acute, distant 
in fruit; corolla 3 mm. long (white?), the tube slender, longer than the calyx-lobes, the lobes 
shorter than the tube, narrowly oblong; capsule hemispheric or subglobose, 2 mm. long and 
broad, shallowly sulcate, smooth; seeds minute, angulate. 
TYPE LOCALITY: Pinos Altos Mountains, New Mexico. : 
DISTRIBUTION: Southwestern New Mexico and southeastern Arizona. 
3. Oldenlandia microtheca (Schlecht. & Cham.) DC. Prodr. 4: 
428. 1830. 
Gerontogea microtheca Schlecht. & Cham. Linnaea 5: 169. 1830. 
Gerontogea Deppeana Schlecht. & Cham. Linnaea 5: 169. 1830. 
Oldenlandia Deppeana DC. Prodr. 4: =o He 
Hedyotis Deppeana Steud. Nom. Bot. ed. 2.1: 727. 1840. 
Hedyotis microtheca Steud. Nom. Bot. ed. 2 1: 728. 1840. 
Oldenlandia latifolia Mart. & Gal. Bull. Acad. Brux. 111: 235. 1844. 
Hedyotis latifolia Walp. Rep. 6:55. 1846. 
Perennial, erect or decumbent, sometimes geniculate and rooting at the nodes, 1-4 dm. 
high, copiously branched, the branches slender, glabrous, or puberulent at the nodes, the 
internodes mostly longer than the leaves; stipules 1-2 mm. long, the margins fimbriate, the 
lobes mostly gland-tipped; petioles slender, 2-5 mm. long, glabrous; leaf-blades mostly ovate or 
lanceolate, sometimes elliptic or broadly ovate, 1—4.5 cm. long, 2.5-18 mm. wide, acute to 
attenuate at the apex, acute or acuminate at the base, usually rather abruptly so, thin, glabrous 
or scaberulous on the upper surface, beneath slightly paler, glabrous or scaberulous, the costa 
slender, prominent beneath, the lateral veins evident but very slender; flowers in terminal and 
axillary cymes, the cymes slender-pedunculate, few-flowered, lax, the pedicels 3-12 mm. long, 
filiform, glabrous, usually erect or ascending; hypanthium less than 1 mm. long, glabrous, the 
calyx-lobes as long or longer, triangular-lanceolate, attenuate, distant in fruit; corolla 5-6 
mm. long, white, the tube greenish, obconic, much longer than the calyx-lobes, the lobes much 
shorter than the tube, papillose inside; style exserted; capsule hemispheric, 2 mm. long and 
slightly broader, glabrous, bisuleate, smooth; seeds minute, angulate, brownish-black. 
TYPE LocaLity* Papantla, Veracruz. 
DISTRIBUTION San Luis Potosi to Puebla and Yucatan. 
4. Oldenlandia Pringlei B. L. Robinson, Proc. Am. Acad. 27: 169. 
1892. 
Cespitose perennial, from long slender scaly rhizomes, about 1 dm. high, erect or ascending, 
much branched, the branches slender, granular-puberulent, densely leafy; stipules minute, 
triangular, succulent; leaves sessile, often with fascicles of leaves in their axils, the blades 
linear, 4-12 mm. long, 0.6—-1.3 mm. wide, acute at the apex, slightly narrowed at the base, 
very thick and succulent, glaucescent, granular-puberulent or glabrous; flowers mostly in 
axillary or terminal cymes, or rarely solitary in the axils and pedicellate, the cymes few-flowered, 
pedunculate, the branches granular-puberulent, the pedicels 6 mm. long or shorter, sometimes 
wanting; hypanthium about 1 mm. long, granular-puberulent or glabrous, the calyx-lobes 
shorter, ovate-oblong, obtuse or acutish; corolla salverform, 5—6 mm. long, the tube stout, 
cylindric, several times as long as the calyx-lobes, the lobes oblong, obtuse or acutish, much 
shorter than the tube, papillose within; anthers included or short-exserted; capsule obovoid- 
turbinate, 2.5 mm. long, terete, smooth; seeds minute, obtusely angulate. 
TYPE Locality: Alkaline plains, Hacienda de Angostura, San Luis Potosi. 
DISTRIBUTION: San Luis Potosi. 
= 
5. Oldenlandia xestosperma Rob. & Greenm. Proc. Am. Acad. 32: 
41. 1896. 
Erect perennial, 2-6 dm. high, slightly puberulent on the stems but elsewhere glabrous, the 
stems few, from a suffrutescent base, sparsely branched above, the branches slender, terete, 
