172 PROCEEDINGS OP THE AMERICAN ACADEMY 



Carex Schaffnert, W. Boott ; new sp. Rootstock creeping, 

 branchitiof, clothed with imbricate brown scales that become fibrous : 

 culm about a foot high, slender, scabrous above on the sharp angles : 

 leaves about equalling the culm, 1 line broad, attenuate to a long fili- 

 form apex, flat or conduplicate above : spike about an inch long, of 3 or 

 more oblong sessile clusters of lanceolate androgynous spikelets, the 

 upper clusters crowded, the lowest distinct and rarely borne on a long 

 radical peduncle ; spikelets 5 or 6 lines long, male above : bracts fili- 

 form from an ovate several-nerved green-keeled hyaline-margined 

 claspin"' base, the lowest much longer than the culm and the next one 

 or two often exceeding it: scales hyaline, pale-chestnut with a green 

 keel, ovate, acute or roughly awn-pointed, exceeding the perigynia, 

 which are pale brown, ovate or lanceolate, 2 lines long, tapering at 

 base, covered with irregular yellowish somewhat scurfy tubercles, 

 obliquely cut at the top and ending in 2 long subulate rough teeth, 

 serrate on the green margins : stamens 3 : stigmas 2, long. ( W. Boott.) 

 — At San Luis Potosi (546 SchafFner). 



CA.REX ? Very near C. varia, Muhl., but differing in its 



stoloniferous rootstock, in its large male spike (an inch long), in 

 the staminate summits of the female spikes, and in the larger and 

 more numerously nerved perigynium, which is much less contracted at 

 both ends. ( W. Boott.) — At San Luis Potosi (547 SchafFner) ; 

 917 Parry & Palmer. 



Paspalum distichum, Linn. At San Luis Potosi (1071 Schaff- 

 ner). Known as " Grama," 



Paspalum Humboldtianum, Fluegge. At San Luis Potosi (1053 

 SchafFner). 



Panicum leucoph^um, HBK, (P. lacnanfhum, Torr.) Col- 

 lected by Palmer (1341) but the locality uncertain, and near Mo- 

 rales, San Luis Potosi (1064 SchafFner). 



Panicum Crus-galli, Linn., var. echinatum, Doell. At Uvalde, 

 Texas (1340). 



Panicum colonum, Linn. At Morales (1038 SchafFner). 



Panicum obtusum, HBK. At San Luis Potosi (1039 Schaffner) ; 

 960 Parry & Palmer. 



Panicum dichotomum, Linn., var. (P. nitidum, Lam.) At San 

 Luis Potosi (1036, 1037 Schaflfner). 



Panicum repens, Linn. {P. arenarium, Brot.) At San Luis 

 Potosi (1040 Schaffner). 



Panicum c^spitosdm, Swartz, ex Fourn., as named at Kew. 

 Morales, San Luis Potosi (1080 Schaffner) ; 962 Parry & Palmer. 



