HORTUS GRAMINEUS WOBURNENSIS. 81 



PANICUM pygm&um, ann. dwarf. Brown Prodr. 

 minutum, ann. minute, ibid. 

 bicolor, ann. two-coloured, ibid. 

 uncinulatum, ann. hook-husked, ibid. 

 effusum, ann. scattered-panicled, ibid. 

 decomposition, ann. decomposed-panicled, ibid. 



**** Spikes alternate or crowded, flowers alternate. 

 semialatum, ann. half-winged, ibid. 



##### Spikes bundled, subdigitate, flowers awnless. 

 parviflorum, ann. small-flowered, ibid. 

 striatum, ann. striated, ibid, i, 

 radiatum, ann. rayed, ibid. 

 divaricatissimum, ann. ibid. 

 Brownii, ann. Brown's nat. N. Holl. R. S. Linn. Syst. Veg. i. 



p. 162. P. villosum, Brown, 1. c. p. 192. 

 *#####: Sp^ed, spikes digitate, bundled, solitary, exterior valve 



of the husk very small, or none. 

 papposum, ann. woolly-flowered, ibid. 

 tenuiflorum, ann. fine-flowered, ibid. 

 propinquum, ann. allied, ibid. 

 gibbosum, ann. gouty, ibid. 

 #*###*#: Exterior flowers masculine, inner feminine, smaller, 



spike-stalk apex naked, awn-like, aquatic, culms creeping. 

 paradoxum, ann. paradoxical, ibid. 

 spinescens, ann. spiny, ibid. 



New Species discovered by Humboldt and Bonpland. 



1. Spikes solitary, spikets solitary, two-rowed. 

 rottboelloides, per. hard-grass-like, nat. S. Amer. 



2. Spikes solitary, spikets in twos, flowering on one side. 

 monostachyum, per. single, nat. S. Amer. 



3. Spikes verticillate, 'bundled, or panicled, much digitated, 



or fingered. 

 ascendens, per. ascending, nat. S.^Amer. 



4. Panicled, spikets conglomerate. 

 decolor ans, per. various-coloured, nat. S. Amer. 



5. Spikets of the panicle spreading, or scattered. 

 diver gens, per. diverging, nat. S. Amer. 

 olyroides, per. amel-corn-like, nat. S. Amer. 

 aturense, per. blackish, nat. S. Amer. 



glaucescens, per. glaucous, nat. S. Amer. Humb. et Bonpl. Nov. 

 Gener. et Spec. i. p. 104. 



