252 



SYNGENESIA ^QUALIS. 



f 



LACTUCA. Gen. Pl. 1234. 



^■m 



Tnvolua^um hnbrica- 



Involucrum 



imb 



ri 



the 

 membranaceum. I scales membranaceous 



turn, cylindriciim^ mar- I cate, cylindrical 



? 



gme 



Semina laevia. Pap- \ alon 



See 



the 

 smooth. 



margm 



pus simplex, stipitatus. 



Receptaculmn nudum. [ pus simple, stipitale 



I Receptacle naked. 



1. Elongata. Muhl. 



L. foliis subtus laevi- 



Leaves smooth tm 



bus, inferioribus run- I derneath. 



the 



lower 



cinatis, mtegerrimis, runcmate, entire, am- 

 amplexicaulibus, infi- } plexicaule, the lowest 

 mis dentatis 

 lanceolatis 



? 



summis [ toothed, the uppermost 

 floribus \ lanceolate; flowers in 



eorymboso-paniculatis. { corymbose panicles 



Sp. pi. 3. p. 1525. 



L. Caroliniana. Walt 



500. Nutt. 2. p. 124. 



L. Longifolia. 



Mich. 2. p. 85. 



Root perennial? Stem four to seven feet high, glabrous. Leaves veiy 



long, glabrous, conspicuously runcinate. Flowers in a large terminal pani- 

 cle, composed of small corymbiform clusters. Involucrum imbricate, the 

 interior leaves long, appressetl until the seed matures, then reflected. Flo- 

 rets numerous. Corolla ligulate, yellow. Seed compressed, crowned with 

 a stipitate, hairy pappus. 



Grows in rich and damp soils. 

 flowers July — September. 



2. Graminifolu. 



Mich. 



L. caule erecto, sim- 

 plici; foliis inermibus, 

 plerisque indivisis, ba- 

 si simplici, longissime 



St 



em erect 



f 



simple; 



linearibus 



7 



leaves unarmed, ^ene 



I 



ally undivided, simple 

 at base, long, narrow; 



panicula , panicle leafless, loose, 



