S¥YNGENESIA. FRUSTRANEA. 179 
gated. Has. On the plains EF Upper Louisiana. Flower- 
A in July. Perennial: 1 to 2 feet high. Rays sometimes 
brownared, as in. esas iertla- ‘13. laciniata, 14. digi- 
tata. i 
A ‘aut ia tnbricat genus, with the exception of R. nu- 
dicaule of Monte Video, which appears to be scarcely dis- 
tinct from 2. spathulata. ay seeds of #. purpurea are 
-pungently aromatic. © 
& 
591. BIDENS. 5 Pas “(Bur ee Spanish 
Needles.) 
Calix subequal, caliculate. Rays often sp tints 
ing. Receptacle paleaceous, flat. Pappus 2 or 
4 reflected or erect and retrorsely epalone 
awns. Seed 4-sided. ee a 
‘ou i bby; leaves mobile oe 
to es or moth 0 
Species. 1. B. cernud. 2. chrysanthemoides. 3. fron- 
_- ‘dosa. 4. connata. 5. pilosa, 6. bipinnaa. Called Spa- 
~ nish Needles; the seeds bemg- Pg penbieensicly tena- 
5g Be 
Almost excl M4 
Goce erence cS ape 
: _cies in Europe and 2 in caine ‘ oe 
"592. COREOPSIS. ZL. 
Calix double, both tee (8 to iy = 
~ interior equal, subcoriaceous and coloured. Re- 
ceptacle paleaceous, scales flat. Seed com- 
prerginate, biden Ment otra mo manely: 
30 Be ei ae yellow, SAldam red, or white, some- 
times 3-lobed.—Scales of the receptacle and the seed pax 
rallel; seed somewhat incurved, not sheathed, | 
ini Leaves eR 
