MACKENSEN: THREE NEW SPECIES OF OPUNTIA 291 
the older joints sometimes more, very numerous on joints formed 
in droughty seasons, erect or spreading, on old joints reflexed; 
flowers opening yellow and turning salmon pink, 7 to 8 cm. broad 
and long; petals relatively thick, obovate, cuspidate, about 3 cm. 
broad, 4 to 5 cm. long; stigma green, 7- to 9-lobed, surpassing 
the stamens; fruit obovate in outline, often broadly so, 3.5 to 
4.cm. broad, 4.5 to 5.5 cm. long, dark purplish red without, purple 
within, the umbilicus convex, the taste nauseous; seeds subor- 
bicular, nearly or quite 4 mm. in diameter, buff, with more or less 
gray on the flat sides. 
The plant flowers in April and May and ripens its fruit, which 
is often proliferous, in August. 
This species is probably the commonest of the various large- 
jointed prickly pears growing about San Antonio. 
The type is no. 619756 in the U.S. National Herbarium. 
Opuntia Griffithsiana sp. nov. 
Plants from somewhat fleshy terete roots, sometimes attaining 
a height of 8 and a breadth of 12 dm., with erect, ascending, and 
Prostrate stems, forming a rather dense growth; joints obovate 
to oval (often broadly so) or circular, thin, 1.5 to 2.5 or sometimes 
3dm. long, the younger pale glaucous, the oldest dirty yellow to 
grayish, and scurfy; leaves subulate, from very short to 10 mm. 
in length; areoles bearing formidable bristles and short wool, and 
on the younger joints usually armed with spines, except below; 
bristles bright reddish brown when young, dirty yellow to brown 
when older, attaining on old joints a length of 12 mm.; spines 
brownish ted to brown below (often to the middle), pale yellow 
or dirty white above, faded in age, straight or sometimes curved, 
somewhat flattened, mostly twisted, rather slender, unequal, 
I to 4.5 cm. long, or sometimes longer, I to 5 to an areole, or on 
Pad we joints sometimes more, very numerous on joints formed 
Pate ip seasons, erect or spreading, or on old joints reflexed ; 
: 's light yellow, turning darker (reddish) in center, 7 to 9 cm. 
‘eae 8 to 10 cm. long; petals obovate to cuneate, often narrowly 
the ‘S Ae 4 +m. broad, 4.5 to 5 cm. long, sometimes emarginate, 
| eae ending In a minute point; stigma green, usually 7- or 8- 
' Surpassing the stamens; fruit oblong-obovate to obovate, 
ids 4 cm. wide, 5 to 8 cm. long, dark purplish red without, the 
bili Purple and pale green, with a nauseous taste, the large um- 
pes Plant flowers in April and May and ripens its fruits, which 
not proliferous, from August till winter. 
