130 BOTANY. 
to preserve and flowers and fruit have not often been found or collected. 
Full notes, living joints, good fruit and seed, and pressed flowers are 
desirable, to make us sufficiently acquainted with these plants. The best 
method of preserving the flowers is to split them open before attempting to 
dry them. Living plants or joints are very valuable, but alone are not 
sufficient, because in cultivation they very rarely flower and scarcely ever 
bear fruit. 
Opuntia (CYLINDROPUNTIA) cLAVATA, Engelm.—aA low, cespitose plant, 
with short (1-3’ high, 1’ thick), clavate, ascending, strongly tuberculate 
joints, the upper areole bearing 4—7 ebony-white, flattened, striate spines, 
surrounded by a number of smaller, bristly ones; yellow flowers, 2’ wide; 
dry, yellow, oval pod, covered with numerous, large, woolly, and long-bristled 
areolz.—E]l Rito, New Mexico, Rothrock, in 1874 (92). Also about Santa 
Fé, ete. : 
OpuNTIA (CYLINDROPUNTIA) PULCHELLA, Engelm. (see Watson’s Bot. 
_ King’s Expl. 119; Simpson’s Report, Botany, t. 3).—A very small, purple- 
flowered species of Nevada. A flower brought home by Mr. Bischoff was, 
by a singular error, enumerated in the Catalogue of 1874 as Cereus viridi- 
florus. 
OpunTIA (CYLINDROPUNTIA) ARBORESCENS, Engelm. (see Watson, 1. c. 
120).—Cuero, New Mexico (101), Rothrock, in 1874; Cienega, South Arizona 
(near Tucson), the same (584); and from Camp Bowie, Ariz. (1002), by 
Mrs. Major Sumner. This handsome species extends northward to the 
plains of Colorado and Pike’s Peak, covering extensive tracts. Remark- 
able for its horizontal, often whorled, branches; purple flowers, 2-24’ in 
diameter; ovary often with some spiny bristles, which at maturity disap- 
pear. The skeleton, as the cactus wood is rather fancifully called after the 
soft tissues have rotted away, forms a heavy, hollow cylinder, with regular 
rhombic holes or meshes corresponding to the tubercles and spine-bunches 
of the plant, and makes excellent canes. This species is closely allied to 
the Mexican O. imbricata and O. decipiens, arborescens being the northern, 
larger-flowered form, but the seeds are different. 
Opuntia (CyxinpropuntiA) BiceLovul, Engelm. (Pac. R. R. Rep. 4, 
