OP ARTS AND SCIENCES. 97 



be the same, but are somewhat more glabrous, the leaves broader, and 

 the corolla more elongated. The species of this genus are very poorly 

 defined and greatly need revision. 



BouvARDiA TRiPHYLLA, Salisb. At Solcdad, Coahuila (2091), a 

 form with the acuminate lanceolate leaves in fours. Nearly the same 

 as 940 Thurber, from Souora, and specimens collected by Graham at 

 Tlalpujahua, and probably DeCandolle's B. qiiaternifoUa. A single 

 specimen with leaves in threes was found in the Caracol Mountains, 

 having the corolla-lobes unusually long (2 lines or more). 



BouvARDiA HYPOLEUCA, Benth. In sandy localities near Morales, 

 San Luis Potosi (712 SchafFner) ; 298 Parry & Palmer. 



Oldenlandia ovata. Annual, low, weak and slender, diffusely 

 branching : leaves ovate to ovate-lanceolate, more or less abruptly 

 contracted into a narrow petiole, acute, glabrous or slightly pubescent, 

 2 to 5 lines long : pedicels axillary and terminal, 2 to 6 lines long : 

 calyx-lobes broad; corolla 1 to 1^ lines long: capsule hemispherical, 

 rounded at base, not exceeding the calyx-teeth : seeds numerous, 

 angled. — At Guajuco, Nuevo Leon (399) ; 200 Ervendberg, and 676^ 

 Parry & Palmer. Differing from 0. microtheca in its foliage and 

 laxer habit, its smaller flowers not paniculate, the broader and ob- 

 tuser calyx-teeth, and more numerous, smaller and less flattened 

 seeds. 



HousTONiA ANGUSTIFOLIA, Michx. A tall diffusely branched 

 form from Georgetown, Texas (396), and from Monterey, Nuevo 

 Leon (2116). 614 Schaffner, from the San Miguelito Mountains, is 

 a low form with rather broad leaves. — Var. scabra, from the Cara- 

 col Mountains (410), is somewhat scabrous, and the short corolla is 

 hirsute in bud toward the apex ; capsules large. 



HousTONiA LONGiPES. Annual, slender, diffusely branched, 

 glabrous, the stems nearly terete : leaves revolute-filiforra, 3 to 6 lines 

 long: flowers on slender elongated pedicels (3 to 12 lines long): 

 calyx a line long or less, with narrow lobes ; corolla 3 lines long, with 

 very slender tube and broad limb pubescent within : capsule short, not 

 exceeding the calyx, round-ovate, very abruptly contracted at base, 

 few- (about 10-) seeded. — From the mountains northeast of Mon- 

 clova, Coahuila (394), and from Monterey, Nuevo Leon (395), and 

 collected also by Dr. Gregg at Cerralbo. It has the habit of H. asper- 

 uloides, but the capsule is very different. 



HousTONiA Palmeri, Gray in Proc. Amer. Acad. 17. 202. At 

 Lerios (397) and in the mountains east of Saltillo (2117), and in the 

 Sierra Madre, south of Saltillo (398). 

 VOL. xviii. (n. s. X.) 7 



