206 Plante Lindheimeriana. 
OPUNTIA. 
§$ 1. Applanate. 
O. mAcRoRHIZA (n. sp.): prostrata; articulis obovato-or- 
biculatis planiusculis; pulvillis setis fuscis et sape aculeis 
singulis binisve instructis ; aculeis teretibus validis porrectis s. 
paulo deflexis basi apiceque fuscis ceterum albidis cum 
adventitio inferiore graciliore reflexo sepe deficiente ; flori- 
bus sulphureis basi intus rubellis; ovario sepalis subulatis 
deciduis 13 in axillis setulas fuscas brevissimas gerentibus 
stipato; sepalis interioribus 15—18 subulatis et (internis) 
ovatis acuminato-cuspidatis ; petalis 8 sepala superantibus 
late obovato-spathulatis obtusis cuspidatis eroso-denticula- 
tis; stigmatibus 5 obtusis, adpressis, stamina numerosa 
eequantibus; bacca subpulposa clavata glabrata ; seminibus 
marginatis. — Naked, sterile, rocky places on the Upper 
Guadaloupe. Flowers (in St. Louis) in June. Root a large 
and fleshy tuber, sometimes 2 or 3 inches in diameter ; joints 
3 —4 inches long, about 2}—3! wide, hardly attenuate at the 
base. Leaves subulate, about 5 lines long. Areole 2-1 
inch distant, more crowded toward the base and on the 
edges: spines (often wanting) 1 inch long, the smaller 4-6 
lines long. Flower 3 inches in diameter: ovary 1 inch long: 
petals 1 inch wide, 13 inch long, pale yellow, red at the base. 
Fruit 1} inches long; the strongly margined seeds compara- 
tively few, 2} lines in diameter. —I have found the same plant 
in similar situations in Western Arkansas ; and it is possible 
that it may be one of Nuttall’s new species (O. mesacantha, 
0. cespitosa, or O. humifusa) of which I cannot find a de- 
scription. — Nearly related to O. vulgaris. 
O. inteRMeDIA, Salm. The species mentioned in Pl. 
Lindh. I. c. No. 1. has since produced abundant flowers and 
fruit, and proves to be the above plant. It is near O. vulga- 
ris, but more erect, or ascending ; the joints much larger; 
flowers larger (4}—5 inches in diameter) ; ovary more slender, 
2—2' inches long, with 20-25 subulate sepals; petals obcor- 
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