176 Dr. J. D. HookEn's Enumeration of the Plants 
Apparently a highly variable plant in the length of the culms, habit of 
growth and hairiness of the vaginze. 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 vagine hairy with long soft-bearded cilia 
seated on conspicuous tubercles; others, from the same locality, are hardly at 
all hairy and have smooth vagine: these agree with individuals from Brazil 
(Martius) 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, “ valvulce dorso 
aculeatze,” 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. fil. ; pilosa pilis patentibus, panicula erecta 
ovatà laxà compressá, glumis lanceolato-subulatis flosculis longioribus 
1-5 floris, flosculis pedicellatis basi barbatis pilis strictis superioribus 
pedicellatis, paleà inferiore oblongo-lanceolatà concava bifida trinervi 
nervo medio in aristam brevem producto; superiore oblonga apice trun- 
catà bicarinatà carinis scabridis, culmis basi geniculatis ramosis foliis 
involutis setaceis longioribus. 
Hab. Albemarle Island, Mr. Macrae. 
Gramen spithameum, erectum. Radix fibrosa, fibris pilosis. Culmi cæspitosi, basi bis 
terve divisi, teretes, nodosi, ad nodos puberuli, obscuré striati, foliosi. Vagine vix ad 
basin fissze, 1 unc. longe, teretes, pilosze, pilis mollibus patentibus in tuberculis minutis 
sitis; ligulà brevi, scariosá. Folia 1-2 unc. longa, erecto-patentia, lineari-lanceolata, 
sub 1-11 lin. lata, involuta, laxé pilosa, ut vaginze dorso tuberculata. Panicula 1j unc. 
longa, 4-} lata, erecta, ovato-lanceolata. Rachis scabrido-ciliata, sulcata. Locusta 
sessiles v. breviter pedicellate, sub 2 lin. longz, 4—5-florz, flore terminali abortivo, 
tabescente. Glumz 2, subzequales, lanceolatze, concave, acuminate; inferior minor, 
Horso laté l-nervi versus apicem nervoque scabrida; superior longior l-nervis. Flos 
