Ifilchcock — The (I'l-asscs of lla-iCaii 217 



several nearly digitate racemes }, to (1 em. Icjiil;- on a iL;lal)r(jns exsi-rteil jJedunele : raehis inter- 

 node and sterile pedicel abont half as long as the spikelet, ])il'ise with l(jng ascending hairs: 

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

 nerved, pilose at base and on the lower half of the back, the hairs ajjpressed, papillose-pilose 

 along the margin above and in a curved line across the top below the ajiex. 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 verv 

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

 atout 2.5 mm. long, this bronze-brown, tightly twisted to the second bend: pediceled s])ikelet 

 alx)Ut 3 mm. long, cuneate-terete below and pilose with short hairs at base, broad, tlat, obtuse 

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

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

 minutely puberulent. 



Escaped from grounds of the United Slates Experiment vSlation. (Jriginall)- 

 described from Australia. Called i\ustraliaii blue grass. 

 Oahn : Honolulu, Hitchcock 14122, 15606; Westgate in 1915. 



4. Andropogon saccharoides Swartz, Prodr. \'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; raehis 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. 



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

 Molokai: Ka Lae o Ka Laau, Rock 8703. 



The lemon grass (Cyinbopogoii citnitits (DC.) Stapf; Andropogon citmtus DC.) is 

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

 tains, Kauai (Forbes C195). 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 gUuiie 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. .\nnual or peren- 

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

 tardily disarticulating racemes. 



[119] 



