' PRICKLY PEARS KOW WILD IN INDIA, 
315 
present date, and moreover fruiting’, in the compound of the Coimbatore 
jail. But the plant has hitherto showh no tendency to run wild in 
India. Koxburgb/s Cactus chinensis, which I believe was this, only 
flowered once in Calcutta in twenty years Voigt, llort. Calc, 
tSuburhaiiuSy 1815, p. 6:2). 
KEY TO THE SPECIES KOW WIEH IX IXDU. 
Calyx not extended into a tube ; stem jointed ; 
joints flat . « . . .Opuxtia. 
Stamens exserted (Subgeniis jSFopalea) 
Stamens not exserted (Subgenus Eu-Opuntia): 
Spines falling except one long one on each 
cushion ...... 
Several large spines remaining on each 
cushion : 
Spines all straight, slender, tawny or 
purplish-black : 
Flowers orange .... 
Flowers at opening lemon-yellow chang- 
ing to rose-pink 
Spines some curved, the largest stout, 
light horn-coloured in life, darkening 
in herbaria with age 
Calyx tube extended ,* stem cylindric, ridged 
0. cochiuelifera. 
0. monacant/ia. 
0. nigricans. 
0. elatior. 
. 0. Billenii. 
.Ceheus 
C. pterogonus. 
ILLIJSTRATIOXS AXO DESCRIPTIOXS IX STAXDARD WORKS. 
Sjpecies 1. — Opuntia cochiuelifera is satisfactorily figured in the 
Botanic Magazine, 1827, plate 2472, and in Karl Schumann^s account 
of the Cactaceae in Martins^ Flora Brasiliensis, iv., pt. 2, 1890, plate 60, 
and passably in Pfeiffer and Otto^s Abbildung BlUhender Cacteen, J843, 
plate 24, and in Andrew’s Botanists^ Repository, 1808, plate 0^33. 
P'urther there is the old plate in Dillen'’s llortus Flthamensis. 
Species 2. — Thei:,e is a good figure of Opiintia moiiacantha in the 
Botanic Register, 1835, plate 1726, another good figure, Imt under 
the wrong name of Cactus Opuntia Tuna in DeCaudolle’s Plantes 
Grasses, 1820, a good but uncoloured figure in Karl SchumaiuCs account 
of the Cactacea3 in Martins’ Flora Brasiliensis, iv., pt. 2, 1890, plafe 62, 
and another showing the habit excellently in Maiden’s Preliminary Study 
