461 
fera, fulgida, and arborescens), and the more slender and less spiny forms 
(of which leptocaulis may be taken as a representative). Exclusive of 
varieties, there are nine representatives of the former group and four 
of the latter. In the first series, bulbispina has as yet been reported 
only from New Mexico, extending southwestward into Coahuila, The 
remaining eight species are massed in Arizona and extend beyond it as 
follows: prolifera only into adjacent California, occurring in the Lower 
‘Californian flora; fulgida and bigelovti, both Sonoran and Lower Cali- 
fornian in origin, extending not only into adjacent California, but reach- 
ing southern Nevada; echinocarpa, whipplei, and acanthocarpa having 
the same extension into California and Nevada, but also reaching 
southern Utah; emoryi and arborescens not extending westward or 
directly northward of Arizona, but stretching eastward to southwest- 
ern Texas, the latter being the only one of the group to reach Colorado. 
Of the four slender and less spiny species kleintw has been reported 
only from southwestern Texas, but its occurrence in Sonora as well as 
Coahuila would indicate a wide Mexican range and the great proba- 
bility that it oceurs in Arizona. In the case of the other three species 
arbuscula is found only in southwestern Arizona; ramosissima extends 
into adjacent California and southern Nevada; while leptocautlis, the 
most common species, extends eastward from Arizona into Texas, even 
as far as the Colorado River. - 
PLATOPUNTIA is represented in our flora by 51 forms, one of which 
(tuna) is a tropical American form extensively introduced by cultiva- 
tion, notably in southern California. Of the remaining 50 forms, 44 
are described as endemic, but 5 being regarded as identical with Mexi- 
can forms. It is hard to avoid the conclusion that this is more an 
expression of our ignorance of the Mexican forms and of specific limi- 
tations than of a fact. Three species occur east of the Appalachians: 
jicus-indica, reaching Florida from the tropics; pes-corvi, a curious 
endemic species of Georgia and Florida; and opuntia, the common 
coast species from Massachusetts to Florida. The remaining 47 forms 
are characteristic of our western flora, but 10 of them ranging north 
of Colorado or east of Indian Territory. Just as Arizona is the center 
of our display of Cylindropuntias, so western Texas and adjacent New 
Mexico are the special home of Platopuntias, 29 of the 47 forms occur- 
ring there. PLATOPUNTIA is characterized by the development of 
three very strong types which display a bewildering maze of forms, 
viz: lindheimeri, mesacantha, and polyacantha. The species lindheimeri, 
of Mexican origin, ranges through our southern border, from the Gulf 
to the Pacific, while two of the varieties, occidentalis and littoralis, are 
confined to southern California, and the other two, dulcis and cyclodes, 
belong to Texas, the latter reaching into adjacent New Mexico. The 
two other types, polyacantha and mesacantha, are far wider in their 
distribution. The type polyacantha is not found in the Arizona-Cali- 
fornia-Nevada region, but ranges far north, extending from Texas into 
