Hitchcock — Tlic Grasses of Hmvaii 193 



long; blades flat, velvety-pubescent. 10 to 40 cm. long, 8 to 15 mm. wide, rounded at the base, 

 acuminate at apex, scabrous on the margins; panicle 15 to 35 cm. long, as much as 20 cm. wide, 

 the branches ascending, pubescent in the axils, often purple; spikelets narrow, 2.5 to 3 mm. 

 long, acuminate, glabrous ; first glume acuminate, S-nerved ; second glume a little shorter than the 

 first, acute, 7-nerved; sterile lemma slightly shorter than the glumes, 7-nerved, the palea ovate, 

 about one-third as long as the lemma; fertile lemma 2 mm. long (fig. 80). 



Type in the U. S. National Herbarium, no. 836474, collected on a wooded 

 hillside on Mount Kaala, at about 1000 meters, July 9, 1916, by A. S. Hitchcock 

 (no. 14013). 



This species differs from P. nephelophihim. in the villous culms and sheaths, 

 the \'elvety pubescent blades and the slightly larger spikelets and fruit. 



Damp woods. 

 Kauai : Halemanu, Forbes 775. 

 Oahu: Mt. Kaala, Hitchcock 14013; Hillebrand in 1856. Palehua, Waianae 



Range, Forbes 1693. Makaleha Ridge. Rock 17082. 

 Molokai: Slopes of Puu Kolekole, Forbes 218. 



Maui: Sand hills, Wailuku, Wilkes Expl. Exped. (Gray Herbarium). 

 Hawaii: Puu Waawaa, Hitchcock 14475. 



13. Panicum xeropMlum (Hillebr.). 



Panicuin ncphcJophiluni y var. xcrophihwi Hillebr. Fl. Haw. Isl. 498. 1888. 



Plants perennial; culms slender, erect, more or less pilose, 15 to 30 cm. tall, the nodes 

 villous; sheaths papillose-pilose: ligule pilose, the hairs 2 to 3 mm. long; blades flat, 5 to 15 cm. 

 long, 1.5 to 3 mm. wide, rather lax, pilose, especially on upper surface; panicle open, 5 to 15 cm. 

 long, oblong, the branches ascending ; spikelets 2 mm. long, glabrous, appressed along the branch- 

 lets ; glumes equal, acute, 5-nerved ; sterile lemma about as long as the glumes, 7-nerved, the 

 lemma ovate-acuminate, half as long as the lemma; fruit 1.5 mm. long (fig. 83). 



Dry plains. Originally described from "dry exposed ridges of Oahu! 

 Lanai ! and Maui ! Maalaea." 



Molokai: Without locality, Rock 8705; Stokes in 1909. Western end. Rock 14005. 

 Lanai: Miki Plain, Munro 295, Dec. 1916, Jan. 1917. 

 Maui: Without locality, Faurie 1316. 

 Without locality: Hillebrand; Mann & Brigham. 



14. Panicum tenuifolium Hook. & Arn. Bot. Voy. Beechey loi. 1841. 



Panicum nephelophihim ^ var. tenuifolium Hillebr. Fl. Haw. Isl. 497. 1888. 

 Panicum nephclophilum p var. rhyacophiluni Hillebr. Fl. Haw. Isl. 498, 1888. 



Plants perennial ; culms erect or sometimes geniculate at base, 30 to 60 cm, tall, sometimes 

 taller, pilose, the nodes villous ; sheaths papillose-pilose ; ligule a line of hairs i to 2 mm. long ; 

 blades flat or more or less involute, 10 to 20 cm. long, 2 to 5 mm. wide, pilose ; panicle open, 

 oval, 10 to 20 cm. long, 10 to 15 cm. wide, the branches ascending; spikelets 3 mm. long, glab- 

 rous, appressed along the branchlets ; glumes equal, acute, 5 to 7-nerved ; sterile lemma about as 

 long as the glumes, 7-nerved, the palea triangular-acute, half as long as the lemma; fruit 1.7 mm. 

 long (fig. 82). 



Dry open ground or open woods. Originally described from "Sandwich 

 Islands." The variety rhyacophiluin was described from "Hawaii! on lava fields 

 of Laieha, 6000 ft. above the sea (Lydgate), Hualali (M. & B. 327).""^ 



'"The specimen in the Cornell Herbarium is 327; in the National Herbariimi and in the Gray Her- 

 barium the number is 237. 



[95] 



