OP ARTS AND SCIENCES. 151 



pubescent ; styles bifid. — Near E. delicatula, Boiss. In the Sierra 

 Madre, south of Saltillo (2053). 



Euphorbia serpyllifolia, Pers. At San Luis Potosi (854 

 Schuffner, in part, and 1034 Schaffuer, in part) ; 810, in part, and 

 811 Parry &, Palmer. 



Euphorbia ammatotriciia, Boiss. (?) Very variable, annual or 

 doubtfully perennial, glaucous and more or less villous, the leaves 

 from round-cordate to linear-oblong, often coarsely toothed ; the reni- 

 form glands with more or less conspicuous white appendages ; capsule 

 comparatively large, acutely angled ; seed smooth. — At San Luis 

 Potosi (854 Schailner, in part, and 856, in part) ; 813 Parry & 

 Palmer. 



Euphorbia radians, Benth. In the San Miguelito Mountains 

 (857 Schaffner) ; 822 Parry & Palmer. 



Euphorbia sph^rorrhiza, Benth. At Morales, San Luis Po- 

 tosi (861 SchafPner) ; 807 Parry & Palmer. 



Euphorbia caltculata, HBK. (?) At Guanajuato (Duges). 

 An imperfect specimen, with leaves (4 inches long) very acute and 

 bristle-tipped, the lower side with the petiole and stem more or less 

 tomentose ; peduncles short and stout ; floral bracts wliite, ovate, ses- 

 sile, 4 lines long ; lobes of the involucre broad and short, fimbriate ; 

 style short and stout. 



Euphorbia (Zygophyllidium) biformis. Stems herbaceous 

 from a tuberous root, a foot high or less, slender, dichotomous, puber- 

 ulent: glandular stipules minute or obsolete; leaves opposite, shortly 

 petioled, linear (| to 2 inches long by 1 or 2 lines broad), or narrowly 

 ovate-oblong (4 to 10 lines long by 2 to 4 broad), entire, obtuse, 

 rounded or cuneate at base : peduncles short, axillary and terminal : in- 

 volucres with inflexed quadrate lacerate lobes ; appendages 4, rounded, 

 whitish: styles short, thick, bifid: capsule \\ lines broad: seeds with- 

 out caruncle, ovate, § of a line long, irregularly pitted and tuberculate. 

 — In the San Miguelito Mountains, San Luis Potosi (860 and 862 

 Schaffner) ; 806 Parry & Palmer. Collected by Schaffuer in two 

 forms, but differing only in foliage, as described. 



Phyllanthus polygonoides, Spring. In the Caracol Mountains 

 (1228), at Monclova, Coahuila, and at Monterey, Nuevo Leon (1229.) 



Jatropha Berlandieri, Torr. At Laredo, Texas (1231). 



Jatropha spathulata, Muell. Arg., var. sessiliflora, Muell. 

 At the same locality (1234), and at San Luis Potosi (Schaffuer) ; 830 

 Parry & Palmer. The leaves on the more vigorous shoots are usu- 

 ally deeply 3-lobed, as in the typical form. Dr. Gregg gives the 



