Hitclicock — Tlic Grasses of Haicaii 217 



several nearly digitate racemes 3 to 6 cm. long on a glabi-ous exserted peduncle ; rachis inter- 

 node and sterile pedicel about half as long as the spikelet, pilose with long ascending hairs ; 

 sessile spikelet about 3.5 mm. long; first glume membranaceous, oblong-oval, obtuse, faintl}' 

 nerved, pilose at base and on the lower lialt ot the back, the hairs appressed, papillose-pilose 

 along the margin above and in a curved line across the top below the apex, the hairs 2 to 3 mm. 

 long ; second glume as long as the first, coriaceous, ridged along the middle, included in the 

 inrolled edges of the first, glabrous, or with a few long hairs at the apex; sterile lemma very 

 thin, acute, two-thirds as long as the glumes ; fertile lemma very narrow, continued into an awn 

 about 2.5 mm. long, this bronze-brown, tightly twisted to the second bend ; pediceled spikelet 

 about 3 mm. long, cuneate-terete below and pilose with short hairs at base, broad, flat, obtuse 

 above, glabrous on the back, pilose with long hairs along the margin and apex, about 7-nerved ; 

 second glume thin, about two-thirds as long as the first, the flat edges turned inward, the tip 

 minuteh' puberulent. 



Escaped from grounds of the United States Experiment Station. Originalh 



v 



described from Australia. Called Australian blue grass. 



to' 



Oabu: Honolulu, Hitcbcock 14122, 15606; Westgate in 191 5. 



4. Andropogon saccharoides Swartz, Prodr. A'eg. Ind. Occ. 26. 1788. 



Culms erect 60 to 100 cm. tall, glabrous, the nodes pilose; sheaths glabrous; blades flat, 

 10 to 20 cm. long, 2 to 4 mm. wide, scabrous-pilose about the base ; inflorescence an oval or 

 flabellate mass of very silky racemes on a glabrous exserted peduncle, the panicle glossy white, 

 5 to 10 cm. long, the axis 2 to 4 cm. long; racemes 2 to 4 cm. long; rachis internodes about 

 3 mm. long", densely pilose with ascending silky-white hairs as much as 7 mm. above, the lower 

 shorter, the sterile pedicel similar ; first glume of sessile spikelet elliptic, about 5 mm. long, 

 several-nerved, densely silky-pilose on the callus and on the lower part of the back, glabrous 

 above, scabrous along the margin at the apex ; second glume narrower and included in the 

 incurved edges of the first glume, firm, strongly ridge-keeled, glabrous, scaberulous at tip, as 

 long as the first glume ; sterile lemma very thin, shorter than the glumes ; fertile lemma very 

 narrow, extending into a pale, obscurely geniculate awn about 2.5 cm. long, tightly twisted to the 

 bend; pediceled spikelet narrow, about 5 mm. long, concealed in the silky hairs of the pedicel, 

 reduced to a single scaberulous-pubescent glume (fig. 105). 



Dry ground along roadside; introduced or escaped from cultivation. 

 Originally described from Jamaica. 



Oabu: Honolulu, near the United States Experiment Station, Hitchcock 14073. 

 Molokai: Ka Lae o Ka Laau, Rock 8703. 



The lemon grass (Cyinbopogon citrafits (DC.) Stapf; Andropogon citratus DC.) is 

 sometimes planted but has scarcely become established. It has been collected in the Hii Moun- 

 tains, Kauai (Forbes 695). This is .a robust reedlike grass, 2 to 3 meters tall, with a large 

 compound inflorescence, a meter or more in length, the 2 short racemes subtended by spathelike 

 sheaths i to 2 cm. long. The outer glume of the sessile spikelet is concave on the back. 



47. HOLCUS L. 



( Sorghum Pers. ) 



Spikelets in pairs, one sessile and fertile, the other pedicellate, sterile but well developed, 

 usually staminate, the terminal sessile spikelet with two pedicellate spikelets. Annual or peren- 

 nial, tall or moderately tall grasses, with flat blades and terminal panicles of i to 5-jointed 

 tardilv disarticulating racemes. 



[119] 



