14- Memoirs Bcruicc P. BisJiop Miisciiui 



Culms densely tufted, erect, glabrous or pubescent, 30 to 100 cm. tall : >licatlis usually 

 loose, glabrous or softly pubescent : ligule membranaceous, about 5 mm. long, lacerate at apex ; 

 blades rather thick. 10 to 20 cm. long. 2 to 4 or sometimes as nnich as 6 mm. wide, glabrous or 

 pubescent, flat or more or less involute, especially toward the apex, tapering to a hard subulate 

 point : panicle erect, close and spikelike, more or less interrupted at base, or sometimes interrupted 

 throughout, or even rather loose. 10 to 20 cm. long, usually about i cm. thick; spikelets in close 

 clusters, i to 3-flowered. compressed : glumes acuminate, alxjut e(|ual in length, about 5 mm. 

 long, scabrous on the keels, scabrous or soft-pubescent on the surface, the first narrow, the 

 • second nearly twice as wide as the first ; lemmas rather firm, scarcely keeled, obscurely 5-nerved, 

 the lower about 5 mm. long, more or less scabrous, awned on the back below the entire or 

 slightly bifid tip. the awn variable, reduced or wanting, or as much as 2 to 3 nun. long : straight 

 or spreading, commonlv shorter on the upper florets, the rachilla joints villous or glabrous 



(figr. 27). 



This species is fairly unil(inii in habit btit varies greatly in the anmunt of 

 pubescence and in the length of the awns. Plants with i -lowered spikelets might 

 be referred technically to Calamagrostis. The si)ecies is intermediate l)et\vcen 

 Tri.setum and Koeleria. 



Open ground, sandy or gravelly slopes or plains. 5000 feet and tipwards. 

 common near timber line. (PI. XXXII. A.) Originally described from "Insula 

 Owhyhee, ad montem Kaah," collected by Macrae in 1825. The type is described 

 as being ]mbescent and as having awns short and erect, or absent from the 

 upper floret. 



Lanai : Kalama. ]\Iunro 317. 



Maui: Haleakala Crater, Faurie 135';, Hitchcock i4()5i), i4<W3, 149Q8. 14953, 

 Rock 8512. 16005. ^hnintains. East Matii. Wilkes Expl. Exped. (Gray 

 Herbarium). 

 Hawaii: Hanehane, Kona. I'Virbes, 1O8; Manna Kea, Eorlies 853, S54, 855; Hitch- 

 cock 14299, 14453, 14457; Rock 8404, 8709, Faurie 1358; region of 

 Sophora, ^^■ilkes Expl. Exped. ; Hnmuula Slieep Station. Hitchcock 14419, 

 14431; Kukaiau Ranch, Hitchcock 14235, 14244; Aina Hou, Forbes 830; 

 Hualalai Mountains, Rock 3628; Hitchcock 145 10, 14520, 14527; IMann & 

 Brigham 326; Luamakani Crater, Rock 32()0; Mauna Loa, Flitchcock 14621 ; 

 north slope Mauna Kea. Hitchcock 14284; Bullock Plains, \\'ilkes Expl. 

 Exped.; \\'aimea, Wilkes Expl. Exi)ed. \\'ithout locality, Remy 82"' (Gray 

 Herbarium). 



13. AVENA L. 



Spikelets 2 to several-flowered, the rachilla bearded, disarticulating above the glumes and 

 between the florets ; glumes about equal, membranaceous or papery, several-nerved, longer than 

 the lower floret, usually exceeding the upper floret : lemmas indurate, except toward the summit, 

 5 to 9-nerved, bidentate at the apex, bearing a dorsal bent and twisted awn (this straight and 

 reduced in Avcna satizv). Annual or perennial, low or moderately tall grasses, with narrow or 

 open commonly few-flowered panicles and large spikelets. 



Lemmas glabrous or nearly so i. A. sativa. 



Lemmas pubescent with long hairs, commonly brown. 



Teeth of lemma acute, not awned 2. A. fatua. 



Teeth of lemma awned 3. A. barbata. 



"The Rciiiy culk'ciioii in the Gray Herbarium has two sheets nunilierccl 82. See Caf'rioUi diictyloii. 



[44] 



