l/ilclicock — Tlic drosses of Ifirwiiii 213 



scaberulous, ajiilaining- a more sti-<)ii,L;l\- scal)crulmis palca and. sonielimes, stamens; fertile 

 lemma acuminate, cartilatiinous, smootli helow, nerved and scaberulous above; caryopsis oblong- 

 oval, a little com]iressed, 3 mm. lonj^. about 2 mm. wide (fig. 106 j. 



Tv])c in tlie L'. vS. National llerhariuni, no. 836482, collected in .sandy soil 

 at Waikiki, near Ilonolnln, J lawaiian islands, Jnne 19, iyi6, by A. S. Hitch- 

 cock ( no. J 380 1 ) . 



Hillebrand"' refer.s this species to-C ccliinafiis. hut ])arts of the spikelet, 

 such as the scaberulous sterile palea, are slightly different. C'. Jiillcbrandianns 

 differs from C. ccliiuatus also in the villous or pilose foliage. The species may be 

 the same as C". laiiiHonis Steud."' from Tahiti, of which I have seen no specimen. 

 The description indicates a much taller plant, having very minute sparse pubescence 

 on sheaths and blades, and a densely lanate axis of the raceme and densely plumose 

 burs. 



Besides the Hawaiian specimens there are in the National Herbarium two 

 others, one from Easter Island (Kuentes 9) and one from Tahiti (JNIoore 220 j. 



A common weed in waste places and cultivated soil ; apparently introduced. 

 Oahu: Pass west of Schofield Barracks, Hitchcock 13960. Honolulu, Hitchcock 



14068, Forbes 102 1. Waikiki, Heller 1964; Hitchcock 13801. ^^'ithout 



locality, Mann & Brigham i. 

 ]\Iolokai: Pukoo, Hitchcock 15056. 

 Tanai : West end, Hitchcock 14716. 

 Hawaii: Kau Desert, Forbes 393. Kilauea Crater, Hitchcock 14610. 



Sugar Cane (Saccliariiiii ofRcinannn L. Sp. 54. 1753) i.*^ extensively cultivated in 

 tbe Hawaiian islands and sometimes persists but does not .spread. It is a tall stout grass, 2 to s 

 meters tall or even taller, with solid juicy stems, broad flat blades, and large plumelike panicles". 

 30 to 60 cm. long, with numerous small spikelets atout 3 mm. long, each surrounded at tbe 

 base by a tuft of silky hairs two or three times as long as the spikelet. 



45. ISCHAEMUM L. 



Spikelets in pairs, ak)ng a straight disarticulating rachis, one sessile and perfect, the other 

 pediceled and usually perfect though not always fruitful; fertile lemma of both spikelets awned, 

 the awn usually developed, .\nnual or perennial grasses with 2, or rarely more, racemes in 

 pairs at the summit of the culms. 



I. Ischaemum byrone (Trin.). 



Spodiopogon bynnii.s Trin. Mem. .Vcad. St. Petersb. \i. Math. Phys. Nat. 2:301. 1S32. 



Iscliacinuui lutcsccns Hack, in DC. Monogr. Phan. 6:221. 1889. 



Plants perennial, sending out stolons ; culms erect from a decumbent base, glabrous, 

 weakly long-pilose at the nodes, 40 to 80 cm. tall ; sheaths glabrous ; ligule prominent, 2 to 4 mm. 

 long, truncate, membranaceous in the center, coalescing at the margins with firm auricles extend- 

 ing up from the sheath ; blades flat, tapering to a fine point, 10 to 20 cm. long, 3 to 5 mm. wide, 

 glabrous, the uppermost much reduced; racemes 2, digitate, tawny or yellowish, 4 to 10 cm. 

 long, the rachis joints pilose at the base and along the margins toward tlie top, triangular, 

 about 4 mm. long, i mm, thick, cupshaped at summit ; sessile spikelet about 7 mm. long, exclud- 



"' Op. cit., p. 506. 



" Steuck-l, Ernst G., Synopsis plantcTrnni Hbnn.-ici'arnm, Vot i. p. no. Stnttgart, 1854. 



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