166 PROCEEDINGS OP THE' AMERICAN ACADEMY 



Ztgadenus PORRiFOLius, Greene. In the Sierra Madre, south of 

 Saltillo (1321). 



ScHCENOCAULON Drummondii, Gray. At Sutherland Springs, 

 Texas (1322), and in the San Miguelito Mountains (536 Schaffner), 

 where it is known as " Matu Curros " ; 882 Parry & Pahner ; 1570 

 Coulter. The Mexican specimens scarcely differ from the Texan, — 

 the stamens usually rather shorter, and capsules somewhat more obtuse 

 at each end. 



Heteranthera limosa, Vahl. At Guadalupe, Texas (1323), at 

 Morales (519 Schaffner) and near Ladrillera, San Luis Potosi (Schaff- 

 ner) ; 899 Parry & Palmer. 



Heteranthera reniformis, Ruiz & Pavon. Near Morales (520 

 Schaffner), and at Guanajuato (Duges) ; 898 Parry & Palmer. 



Heteranthera Mexicana. Stems short, ascending from a short 

 rooting base, somewhat glandular-pubescent above with the inflores- 

 cence : leaves linear with a dilated sheathing base, 3 or 4 inches long 

 by 1 or 2 lines broad: spathe ovate-lanceolate, acuminate, 9 lines 

 long: spike pedunculate above the spathe, 2 to 4 inches long, 12-15- 

 flowered, naked, the flowers scattered, ascending : perianth-tube 3 or 4 

 lines long, greenish, pubescent, the limb as long, spreading, blue with 

 white centre : one stamen nearly twice longer than the others and 

 equalling the style : capsule oblong-ovate, 2 or 3 lines long : seeds 

 nearly globose, 12-striate. — Closely resembling If. Seuhertiana. At 

 Juraz, on the Sabinas River, Coahuila (1324). 



Commelina pallida, Willd. In the Sierra Madre, south of Sal- 

 tillo (1326), and at Guanajuato (Duges), where it is called " Yerba 

 del Polio." 



Commelina Virginica, Linn. At Uvalde, Texas (2015). 



Commelina graminifolia, IIBK, At San Luis Potosi (526 

 Schafl'ner) ; 903 Parry & Palmer. 



TiNANTiA FUGAX, Scheidw. At Guanajuato (Duges). 



Tradescantia Karwinskyana, Roem. & Schult. In the Sierra 

 Madre, south of Saltillo (1325), and at San Luis Potosi (525 Schaff- 

 ner) ; 900 Parry & Palmer. 



Tradescantia crassifolia, Cav., var. (?) angustifolia. Low 

 (a foot high or less) : leaves linear to linear-lanceolate : umbels loosely 

 few-flowered : sepals less than 3 lines long, villous or glandular- 

 pubescent : ovary hairy only at the summit. — In the Sierra Madre, 

 south of Saltillo (2016), and in the Morales Mountains (521 Schaffner) ; 

 253 Gregg. The typical form was collected by Schaffner (523) in the 

 San Miguelito Mountains ; 902 Parry & Palmer. 



