142 MACKENSEN: TWO NEW SPECIES OF OPUNTIA 
brown (or sometimes darker) center, about 7 cm. broad and 8 to 
10 cm. long; petals 4 cm. long, obovate, with a large cusp; stigma 
white, 6- to 8-lobed, about equaling the stamens: fruit elongated 
(2.5 to 3.5 cm. thick, 5 tog cm. long, or sometimes longer), consist- 
ing of anelliptic body, with a narrow (often funnelform) umbilicus 
and a more or less stipiform base, which is sometimes equal in 
length to the body but usually shorter, the fruit-in ripening be- 
coming purplish throughout and finally crimson externally, the 
base becoming colored tardily, the taste nauseous: seeds subor- 
bicular, nearly or fully 4 mm. in diameter, when dry gray with a 
buff margin. _ 
The plant blooms in April and May and produces an abun- 
dance of fruit, which ripens in August and September. The fruit 
is sometimes proliferous. 
This species is intermediate between the groups represented by 
Opuntia macrorhiza and O. Lindheimeri, respectively. It differs 
from both in a large proportion of the points covered by the descrip- 
tion, so that it is necessary to consider it a distinct species. The 
slenderness of the fruit is very characteristic, hence the specific 
name. 
The description was drawn from plants growing in their native 
habitat at San Antonio, Texas, and here, too, the type material 
was collectedin 1910. The type is mo. 618292 in the U.S. National 
Herbarium. 
Opuntia Roseana sp. nov. 
Plants with somewhat fleshy terete and thick-tuberous roots: 
stems commonly several, mostly erect or ascending, sometimes 
attaining a height of 3 dm., often consisting of an unbranched 
row of joints; joints mostly relatively thick, obovate to orbicular, 
4 to 13 cm. long, often with a shriveled appearance; leaves stout, 
2 to 3 mm. broad at base, 4 to 7 mm. long; areoles (often on a de- 
cided prominence) filled with pale yellow or whitish bristles 1 to 
6 mm. long, only the areoles about the margin of the upper half 
of the joint armed, or often the entire joint spineless; spines usually 
white, some joints with a few amber or brownish ones, slender, 
very short to 2.5 cm. long (or in rare cases 3 to 5 cm. long and very 
slender), twisted, nearly terete, 1 to 2 or sometimes 3 to an areole, 
the lower one often reflexed, the others usually erect or spreading: 
flowers pale yellow with a claret center, about 6 cm. broad and 
long; stigma white, 5- or 6-lobed, equaling the stamens: fruit 
obovate-oblong to elliptic-oblong, often narrowly so, 1.5 to 2 cm. 
wide, 3.5 to 4.5 cm. long, with a crateriform umbilicus, a dull 
