Hartwegiane. N. O. Euphorbiacere. 
TAB. CCCXLVI. 
EuPHORBIA sPH@HRORHIZA. Benth. 
Glabra, radice tuberosa spheerica, caule herbaceo erecto dicho- 
tomo, foliis linearibus integerrimis utrinque angustatis, involu- 
cris solitariis breviter pedicellatis, laciniis interioribus brevis- 
simis fimbriatis, glandulis truncatis dorso in appendiculas 
ovatas fimbriatas coloratas productis. Benth. 
Euphorbia spherorhiza. Benth. Pl. Hartw. p. 8. 
. Zacatecas, Mexico. Hartweg. 
_An Euphorbia very distinct from any hitherto described, with 
the habit, as Mr Bentham observes, of E. Jpecacuanha, but very 
different in the involucres and in the extremely narrow leaves. 
Root a globose bulb, with a few fibres from below. Involucre 
cup-shaped, 1-2 between each upper pair of leaves, or from the 
axil of the upper dichotomies, hairy, with 5 glands at the mar- 
§in, each spreading out into a white petaloid 2-3-cleft append- 
age. Inner lacinize alternating with these, short, membranous, 
bifid, and denticulate. 
bE 
Fig. By 2. Involucres with male flowers. f. 3. Gland from 
~~ Margin. J. 4. Inner lacinia :—magnified. 
