HORTUS GRAMINEUS WOBURNENSIS. 109 



DIPLACHNE. Diplachne. Generic character : calyx 7-9- 

 flowered, apex of the superior valve mucronate ; corolla, in- 

 ferior valve bilacinate, bristly between the lobes or lacines, 

 superior subtruncated, emarginate ; panicle simple, branch- 

 ing, branches alternate, slender, or filiform. R. S. Linn. Sys. 

 Veg. 

 fascicularis, ann. bundled, nat. America, Illinois, ibid. Festuca 



fascicularis, Lam. 

 fusca, ann. brown, nat. Egypt, ibid. Festuca fusca, Linn. Sp. 



PI. i. p. 109. 



ENNEAPOGON. Nine-bristled grass. Generic character : spikekts 

 scattered, 2-3-flowered : calyx, valves longer than the flowers, 

 inferior less ; corolla, exterior valve with 9 bristles, nearly 

 equal, margins bearded, superior valve awnless, entire, rather 

 obtuse ; style two-parted ; spike simple. 

 gracilis, ann. slender, nat. N. Holland. B. Prodr. i. p. 185. 



Pappophorum gracile. 

 purpurascens, ann. purple, nat. N. Holland, ibid. Pap.purpu- 



rascens. 



pallidus, ann. pale, nat. N. Holland, ibid. Pap. pallidum. 

 nigricans, ann. blackish, nat. N. Holland, ibid. Pap. nigricans. 

 pMeoides, ann. cat's-tail, nat. S. America ? R. S. L. Sys. Veg. i. 



p. 616. 



TRIR APHIS. Generic character : calyx 2 or many-flowered, 

 superior floret neuter ; corolla, inferior valve with 3 straight 

 awns rising from the apex, superior awnless ; panicle com- 

 pound ; spikelets 2-rowed. Brown. 

 pungens, ann. pungent, nat. N. Holland. Brown, Prodr. i. 185. 



R. S. L. S. V. i. p. 617. 

 mollis, ann. soft, nat. N. Holland, ibid. R. S. L. Sys. Veg. i. 



p. 617. 



KOELERIA. Koeleria. Generic character: calyx 2-valved, 

 2-5-flowered, florets shorter ; corolla 2-valved, inferior, en- 

 tire, bristled, superior, bifid ; panicle spike-like, branches 

 heaped. 



cristata, per. crested, indig. Aira cristata, Linn. Spec. p. 94. 

 Poa cristata, Willd. Spec. See Aira cristata, R. S. Linn. 

 Sys. Veg. i. p. 620. 



/3. cristata pyramidalis, pyramidal. Poa pyramidalis, ibid. 

 7. cristata gracilis, slender, Poa nitida, Lam., ibid. 

 3. cristata grandiflora f larger-flowered, ibid. 



