431 
Kellerman of 1888): ARKANSAS (no collector given, but cult. in Mo. 
Bot. Gard. from White River, near Fayetteville). 
38. Opuntia mesacantha greenii, var. nov. 
Opuntia greenti Engelm. MSS. 
With fibrous roots, orbicular-obovate deep-green joints, numerous 
short reddish-brown bristles, upper pulvini armed with 1 to 3 spines 
(upper one straight, stout, terete, 2.5 to 3.5 em, long, lower ones mostly 
smaller, paler and detlexed), which are brownish-red at base or entirely 
so, ovate spineless fruit 3 em. long with rather shallow umbilicus, and 
irregular seeds with broad rather acute margins and 6 mm. broad.— 
Type, Greene of 1870 in Herb. Mo. Bot. Gard. 
From Colorado to Arizona. 
Specimens examined: CoLoRApo (EH. L. Greene of 1870, Golden City ; 
OC. S. Sheldon, Ft. Collins): AR1zoNA (Toumey of 1892, Grand Canon 
and Williams; Wilcox of 1894, Ft. Huachuea). 
39. Opuntia mesacantha oplocarpa, var. nov. 
Opuntia oplocarpa Engelm. MSS. 
Joints orbicular, deep-green, 7.5 to 8.5 em. in diameter: pulvini with 
a penicillate tuft of long brown bristles at upper end, all armed except 
the lower ones: spines mostly 2, rather stout and straight, the upper 
one reddish-brown (especially toward the base), stouter, erect or por- 
rect. the lower one paler (or even white), deflexed and usually weaker: 
fruit clavate, with broad and shallow umbilicus, rather dry, spineless 
(or nearly so), brownish-red, 5 em. long: seeds wavy-twisted.—Type, 
Greene of 1870 in Herb. Mo. Bot. Gard. 
Colorado to southwestern Texas. ; 
Specimens examined: CoLorapo (F. L. Greene of 1870. Golden City): 
TEXAS (G. R. Vasey of 1881, EK] Paso). 
This certainly belongs to the maze of forms under mesacantha, and possibly may 
be referred to some of those described above, ‘The seeds and orbicular joints suggest 
cymochila, but the prominent tufts of long brown bristles, the fewer spines, and the 
decidedly larger distinctly clavate unarmed fruit seem to justify separation for the 
present. The Vasey material has larger joints (about 12 cm. broad), and its spines 
are not always in pairs. Often there are three spines, two equally prominent brown 
upper ones and a lower and weaker deflexed white one, and even two or three very 
weak ones in addition appressed at lower edge of pulvinus. These characters are 
suggestive of cymochila, but the larger joints and prominent reddish-brown bristles 
are quite distinctive. The two varieties greenii and oplocarpa are very near each 
other, and aside from the seed characters are to be distinguished by the shape of the 
joints, by the fact that the former has its 1 to 3 spines only on the upper pulvini, and 
the latter, with its spines mostly in pairs, has all the pulvini armed except the low- 
est ones. In both, the upper reddish porrect or ascending spine or spines and the 
lower pale deflexed one are quite characteristic. 
40. Opuntia mesacantha vaseyi, var. nov. 
Approaches oplocarpa, but joints narrow and rather elon gate-obovate 
(16 by 10 em.), very large pulvini, the 2 or 3 spines (occasionally another 
short, slender one added) all reddish-brown (oceasional trace of yellow- 
8898—No 7——6 
