GKAMINEJ;. 553 



/ 136. P. dichotomum, L. Leaves lanceolate, acuminate ; panicle few-branched : 

 branches scattered, simple, or lower compound : pedicels unequal, hair-like : spikelets elHp- ' 

 tieal, iluntish ; lowest glume J-i as long as the spiJeelet, bluntly deltoid, 3 superior equal- 

 ling the flower, 9-T -nerved, third with a short palea ; fertile flower ellipsoidal, blunt, 

 smooth, more than half terete: palea slightly convex. — Leaves 3"'-li"' broad ; ligule long- 

 ciliate ; panicle l"-li", spikelets i'" long. The West Indian forms are : 



a. acuminatum, Sw. / Leaves and sheaths densely and softly pilose ; panicle subincluded ; 

 spikelets pubescent. — Stem creeping, or ascending, 6"-8" long. 



;8. glabrescens. Densely ctespitose, low ; leaves glabrous, except at the .tubercled-ciliate 

 base : sheath ciliate ; panicle peduncled, exserted ; spikelets glabrous. 



Hab. Jamaica, Sto., M'Nb.,m sandy hills (o) ; Fd., in mountain-savannahs (j3) ; [United 

 States !]. 



38. ISACHNE, B. Br. 



Character of Panicum, bnt sterile flower chartaceous like the fertile one. — Habit of Pani- 

 cum, sect. Miliaria. 



137. 1. arundinacea, Gtr. Sioai, glabrous ; ^eawes fow^, lanceolate, narrowly acuminate ; A 

 panicle dense, oval : branches compound, filiform : pedicels short, unequal ; spikelets ovoid ; '* 

 3 inferior glumes equal, costate-5-nerved, glabrous, lowest often ciliate above, exceeded by 

 the (? flower, as long as the fertile ; both flowers glabrous, half-terete. — Panicum, /Sw. .' P. 

 dispermum. Lam. I. panicea, Tr. I. dubia, Kth. — 4-10' high, woody at the base; leaves 

 5"/_10"' broad ; panicle 3"-6", spikelets V" long.-r^HAB. Jamaica I, &w., Macf., in high 

 mountains, S. Andrews ; S. Vincent, Guild. ; [Martinique I, Mexico !, Venezuela I]. 



138. I. rigens, TVin. Decumbent, branched ; leaves short, linear, acuminate, usually 

 scabrous : sheath ciliate ; panicle short, spreading : branches scattered, nearly simple : pedi- 

 cels unequal, obtuse-angled; spikelets ovoid; 2 inferior glumes unequal, 7(— 5)-nerved, 

 slightly scabrous, lowest exceeded by the (f flower, as long as the fertile ; both flowers gla- 

 brous, pubescent at their callus, fertile and little distant, half-terete.- — Panicum, Sw. ! P. 

 arbnsculum, Sieb. Mart. 265.— 6"-12" long; leaves l"-3" long, H"-2" broad; panicle 

 ]"-2", spikelets i"'Jong. — Hab. Jamaica !, Suti., Maqf., in high mountains ; [Martinique ! ; 

 Venezuela!]. 



129. I. pygmsea, Gr. {n. sp.) Low, decumbent, csespitose, diffuse, glabrous; leaves 

 short, linear, acuminate, rigidly spreading, polished-striate, cartilaginous at the margin : 

 sheath shortly ciliate above, or glabrescent ; panicle short, simple,' contracted ; pedicels 

 short, angular : spikelets ovoid ; 2 inferior glumes subequal, 6-nerved, glabrous, exceeded 

 by both flowers ; both flowers glabrous, half-teretc^Ahont 2" high, forming tufts of 

 .3"-4," diam. from a fascicled root ; leaves distichous, 6'" long, i"'-V" broad ; panicle 

 scarcely exserted, linear, 3"'-6"' long, green : branches few, appressed, with a few, geminate, 

 unequal pedicels; spikelets blunt, %'" long.— Hab. Jamaica!, Macf., probably an alpine 

 grass, like the preceding. 



39. HYMENACHNE, P. B. 



Character of Panicunt, --hat fertile flower chartaceous, or coriaceous, not indurated in fruit, 

 and panicle contracted. — Tail, erect, glabrous, aquatic or bog-grasses'; panicle long, spiceform. 



130. H. Myurus, P. B. Leaves cordate at the clasping base, lanceolate-acuminate, or 

 lanceolate-linear; panicle cylindrical: pedicels short: spikelets lanceolate, acuminate; 

 lowest gliune one-third as long as the spikelet, 2 superior 3-5-nerved, slightly unequal, third 

 devoid of a palea ; fertile flowers chartaceous, oblong-lanceolate, pointed, little shorter than 

 the third glume, compressed fromthe back.— TKk. Ic. t. 305.— Panicum, Lam. P. amplexi- 

 caule, Rudg.—&' high; leaves, 6"'-3"' broad; panicle green, 6"-15", spikelets 3'" long.— 

 Hab. Jamaica !, Pd., Bist., in ditches; Dominica!, Imr. ! Trinidad !, dr.; [French islands 

 to Brazil ! ; East Indies !]. 



131 H. fluviatilis, Ns. Leaves linear ; panicle cylindrical: pedicels short : spikelets 

 ovate, 'pointed; lowest glume half as long as the spikelet, 2 superior 7-9-nerved, equal, thii'd 

 with a Balea ■ fertile flowers coriaceous, ellipsoidal, pointed, subterete, half- as long as the 

 second and third glume.-Trin. Ic. t. 204.-P. vilfoides, ZH«.-U'-3' high ; leaves 2"'-3"' 



