i82 



TRIANDRIA DIGYNIA. 



4 — 18 inches long, 5 — 4 lines wide, liairVj a little scabrous, particular 

 ly on the upper surface, the margins sometimes undulate, and witli 

 the sheaths tinged with purple; sheaths shorter than the joints, hairy*. 

 Spikes alternate, opposite and fasciculate ; spikelets in two rows. 

 Rachis linear, spikelets alternate, affixed to the midrib. Calya? gla- 

 brous; exterior valve small, interior twice as large. Corolla^ valves 

 equal to the interior valve of the caljx ; all lanceolate. Filaments 5^ 

 Jlnthers and St\^mas pale purple- 

 Grows every where on lands not inundated. Well known to plan- 

 ters under the name of crab or crop grass. It is the mosttroublesoiue 

 grass our planters have to encounter in high ground culture, and 

 though an annual, it is the best grass for hay at present known in our 

 low country. 

 Flowers tlurough the summer. Furjjle Digltaria — Crab Grassy 



m 



S. ViLLosA. Walt? 



D. culmo decumbente 



dense csespitoso 



5 



folio- 



Stem decumbent, form- 

 ini^ thick tufts; sheaths of 



rum vaginis villosissimis ; the leates very villous f 



spiculis trifloris ; floribus spikelets 



3 



flowered ; 



pedunculatis ; calycis val- 

 va exteriore mmima. E. 



flowers all on footstalks ; 

 extei ior valve of the ca- 

 lyx verj small. 



D. serotina, Mich. 1. p. 4G. 

 Syntherlsma villosa ? Walt. p. 77. 



Root perennial, creeping. Stem 19 — 18 inches long, columnarr 

 hairy at the joints, geniculate, decuinbent, covering with a thick car- 

 pet the ground it occupies. Leaves linear-lanceolate, thin, and wiW 

 the sheaths very villous. Spikes 2—3 inches long. Calyx, the cv 

 tierior valve scarcely one fourth the size of the interior, pubcscentr 

 hairy along the margin. 



Grows generally in close soils^ 

 J"lowers July — October. 



Frocumhent Digitan<i 



3. FlUFORMK. 



D. culmo erecto : foliis I Stem erect; leaves some- 



subglabris ; spiculis erec- 

 tis, trifloris ; floribus ped- 

 i( ellatis ; calycis valvis 



what glabrous 



subfequalibus. 



E. 



pikelets 

 erectj's flowered -, flowers 

 all on footstalks ; valves 

 of the calyx nearly eq« 



45. 



D. pilosa ? Mich. I. 



Syntherisma serotina ? Walt. p. 76, 

 ^^icuna fiUforme ? Sp. pi. l. p. 343V 



