172 composite. [ Psiadia . 
Rodriguez, rare in the unfrequented parts of the island, Dr. Balfour. En- 
demic. 
Sarcanthemum Coronopus , Cass. DC. Prod. v. 367 (Conyza, Lam.), gathered by 
Commerson in Rodriguez, by Bory in Bourbon, and attributed by Sprengel to 
Mauritius, may perhaps be one of the varieties of P. trinervia. It is said to be a 
viscose shrub, with alternate crowded linear-lanceolate leaves 2-3 in. long, \ in. 
broad, obscurely triplinerved and toothed near the tip and narrowed to the base, a 
flat fimbrilliferous receptacle, small flowers crowded in terminal corymbs, and the 
central tubular flowers as in Dichrocephala with an inflated, not a narrowly funnel- 
shaped mouth. It cannot. I think, be the Bourbon P. retusa, DC., as suggested by 
Cordemoy in the Adansonia, vol. x. p. 24. 
15. ABROTANELLA. Cass. 
Mowers all tubular, those of the circumference female, those of the 
disk hermaphrodite. Involucre campanulate ; scales few, narrow, im- 
bricated, subequal in length, or 1-2 of the outer ones larger, subherba- 
ceous. Receptacle naked, narrow. Anthers not tailed. Branches of 
the style short, truncate. Achenes compressed or tetragonal, glabrous, 
the pappus none or minute and coroniform. — Dense csespitose minute 
perennials with alternate leaves and solitary or sparsely corymbose 
terminal heads. Distrib. Species 10, the others Antarctic American 
or inhabitants of New Zealand and South Australia, 
1. A. rhynchocarpa, Balf fil. Shrubby, densely csespitose, glabrous 
in all its parts, not rising above half an inch above the soil. Leaves in a 
rosette, oblanceolate, fleshy- coriaceous, subacute, entire or pinnatifid 
with 1-2 deep lobes on each side, narrowed into a flattened petiole, 
which is longer than the lamina and dilated at the base. Heads soli- 
tary, sessile in the centre of the rosette, few-flowered, i n - long. 
Scales few, irregularly biserial, equal in length, linear, with a herbaceous 
centre and hyaline obscurely ciliated edge. Achenes as long as the 
corolla-tube, black when mature, compressed, glabrous, in. long, with 
3 distinct ribs on one side and two on the other. 
Rodriguez, on the coralline limestone, in small quantity, Balfour ! Endemic. 
16. XANTHIUM, Linn. 
Heads of flowers monoicous, the male ones many-flowered, with 
tubular corollas and an involucre of numerous free spineless bracts, the 
females without corollas, only two in a head, with a connate involucre 
armed with toothed spines. Anthers not tailed. Style-branches of 
female flowers slender. Involucre of female flowers two-celled, with 
a septum representing the scales of the receptacle. — Coarse annual 
herbs, with alternate leaves, and copious heads forming terminal and 
axillary panicles. Distrib. Cosmopolitan weeds. Species 4. 
Branches spineless. Leaves green, obscurely grey-downy 
beneath 1. X. strumarium. 
Branches armed with trifid spines. Leaves clothed with 
white tomentum beneath 
2. X. spinosum. 
