176 Dr. J. D. Hooker's Enumeration of the Plants 



Apparently a highly variable plant in the length of the culms, habit of 

 growth and hairiness of the vaginae. Some of Mr. Macrae's specimens (from 

 Albemarle Island) are erect, upwards of a span long, with the slender spikes 

 two or three inches long, and the vaginse hairy with long soft-bearded cilia 

 seated on conspicuous tubercles ; others, from the same locality, are hardly at 

 all hairy and have smooth vaginae: these agree with individuals from Brazil 

 (Martins) and the Island of St. Vincent. Mr. Darwin's Charles and Chatham 

 Island specimens are distinguished by their erect or procumbent culms, their 

 more contracted or elliptical dense spikes, their much smaller leaves and their 

 nearly smooth sheaths. In the P. Peruviana, Jacq., which has hirsute leaves, the 

 upper valves of the glumes are described by Willdenow as subciliated, a cha- 

 racter noticed by Jacquin himself (Coll. 1. p. 107), who says, " valvulae dorso 

 aculeatse," but in his figure 1. t. 18, they are represented quite smooth. His 

 specimens were raised from seed. I do not observe the length of the cilia to 

 vary in any of the specimens (in Herb. Hook.), nor in the P. Boryana, Willd. 

 (Mauritius), which seems to me undistinguishable from the West Indian plant. 

 A small state of the same has been collected near Gedda in Arabia. 



50. Calamagrostis pumila, Hook.Jil. ; pilosa pilis patentibus, paniculS, erects 

 ovata lax& compressa, glumis lanceolato-subulatis flosculis longioribus 

 1-5 floris, flosculis pedicellatis basi barbatis pilis strictis superioribus 

 pedicellatis, palea inferiore oblongo-lanceolata concava bifida trinervi 

 nervo medio in aristam brevem producto ; superiore oblonga apice trun- 

 cata bicarinata carinis scabridis, culmis basi geniculatis ramosis foliis 

 involutis setaceis longioribus, 



Hab. Albemarle Island, Mr. Macrae. 



Gramen spithamseum, erectum. Radix fibrosa, fibris pilosis. Culmi caespitosi, basi bis 

 terve divisi, teretes, nodosi, ad nodos puberuli, obscure striati, foliosi. Vaginae vix ad 

 basin fissae, 1 unc. longae, teretes, pilosae, pilis moUibus patentibus in tuberculis minutis 

 sitis ; ligula brevi, scariosa. Folia 1-2 unc. longa, erecto-patentia, lineari-lanceolata, 

 sub 1-lj lin. lata, involuta, laxe pilosa, ut vaginae dorso tuberculata. Panicula 1 ^ unc. 

 longa, \-^ lata, erecta, ovato-lanceolata. Rachis scabrido-ciliata, sulcata. Locustae 

 sessiles v. breviter pedicellatae, sub 2 lin. longae, 4-5-florae, flore terminali abortive, 

 tabescente. Glumae 2, subaequales, lanceolatae, concavae, acuminatae ; inferior minor, 

 dorso late 1-nervi versus apicem nervoque scabrida; superior longior l-nervis. Flos 



