SYNGEXESIA. FRUSTRANEA. 179 



gated. Hab. On the plains of Upper Louisiana. Flower- 

 ing- in July. Perennial; 1 to 2 feet high. Ra\s sometimes 

 brown-red, as in Tagetes patnla. 13. laciniata. 14. digi' 

 tata. 15. pinnata. 



A North American g-enus, with the exception of R.nu- 

 dicaide ot Monte Video, which appears to be scarcely dis- 

 tinct from R. spathidata. The seeds of R. purpurea are 

 pungently aromatic. 



591. BIDENS. L, (Bur Marygold, Spanish 



Needles.) 

 Calix subequal, caliculate. Rays often want- 

 ing. Receptacle paleaceous, flat. Pappus 2 or 

 4 reflected or erect and retrorselj scabrous 

 awns. Seed 4-sided. 



Herbaceous, rarely shrubby; leaves mostly opposite, 

 often pseudopinnate; flowers axillary or terminal. 



Species. 1. B. cermia. 2. chrysanthemoides. 3. fron- 

 flosa. 4. connata. 5. pilosa. 6. bipinna a. Called Spa- 

 nish Needles; the seeds being very troublesomely tena- 

 ceous. 



Almost exclu sively an American genus, extending into 

 the tropical regions as far as Peru, there are also 2 spe- 

 cies in Europe and 2 in India. 



592. COREOPSIS, i. 



Calix double, both many-leaved, (8 to 12), 

 interior equal, subcoriaceous and coloured. Re- 

 ceptacle paleaceous, scales flat. Seed com- 

 pre.ssed, emarginate, bidentate, dentures rarely 

 awned. 



Herbaceous; leaves mostly opposite, pseudopinnate, 

 ternate or rarely entire; flowers fastigiate, terminal, or 

 also dichotomal; rays yellow, seldom red, or white, some- 

 times S-lobed. — Scales of the receptacle and the seed pa- 

 rallel; seed somewhat incurved, not sheathed, 

 t Leaves opposite, undivided. 



Species. 1. C. lanceolata. 2. crassifoUa. 3. arguta. Ph. 

 Apparently a variety of tlie following. 4. latifolia. 



5. * rosea. Small and very smopUi; stem mostly simple; 

 leaves linear, entire, axills leafy; flowers tew, long pedun- 

 culate, dichotomal and terminal; rays red, unequally 3- 



