Tristeginem.] CC. GRAMINEZE, 1121 
acutiuseule, inuticze, plurinerves, circa florem convolute, clause, tertia vacua subbrevior, 
angusta, hyalina v^ superne breviter membranacea villosaque; quarta sub flore a basi 
minima tenuissime hyalina in aristam longam rigidam tortam producta ; palea minima, 
hyalina, truncata, ciliolata. Lodicule majuscule. Stamina3. Styli distincti, stigmatibus 
plumosis. Caryopsis oblonga, glumis inferioribus rigide coriaceis arcte inclusa. —Gramina 
elatiuscula, foliis longis planis. Panicula longa, anguste thyrsoidea, floribunda, pilosa, 
ramulis erectis flexuosis. 
Species v. potius varietates 2, altera Peninsnle Indi: orientalis, altera Africze tropicze incola. 
Genus primo aspectu Sorgho subsimile, sed spieulze omnes hermaphrodite nec unquam geminze. 
Tarsus V. ZovsiEx. 
60. zilaria, H. B. et. K. Nov. Gen. eb. Sp. i. 116, f. 9r. . (Pleuraphis, Torr. dm Ann. 
Lyc. N. York, i. 148, 1. 10. )—Spicule inis in fi 
deciduum congest:ze, centralis flore unico fcemineo v. vem lteig laterales floribus 2 
masculis, fasciculis secus rhachin spics simplicis fere sessilibus. Glum:e 4, 2 exteriores 
vacus, rigidule, tenues v. indurate, involucrum simulantes, extima major, polymorpha, 
smpius oc-nervis, indivisa v. bifida, apice dentata v. lacera, dorso inter lobos aristata v. 
mutica, secunda angustior, scepius carinata, integra v. 2-dentata, mucronata subaristata v. 
mutica, tertia et quarta membranaceo- dale integr:e v. apice dentatz, utraque in spiculis 
masculis florem pal , tertia in spicula fertili vacua (v. interdum 
deficiens ?) ; terminalis  spiculze fertilis nunc a basi T longe lineari- ponmipates o 
gradatim angustata v. undique zequilata, florem & v. 
Stamina 3. Styli basi breviter connati (v. distincti iu stigmatibus breviter plumosis. 
Caryopsis ovata v. breviter oblonga, glumis involucrantibus inclusa, libera.—Gramina 
basi decumbentia, ramosa v. czespitosa, stolones repentes szepius Supe foliis angustis 
planis v. luto-t Spic:e in ped terminali solitarize, breves v. longius- 
cule, fasciculis approximatis quaquaversis basi sepius annulo pilorum cinctis a rhachi 
articulatim secedentibus. Spicul:e in fasciculo sessiles. 
Species 5 v. 6, Mexicans, ab America centrali usque ad "Texas et Californiam extense.  Fourn. 
Gram. Mex. 72. — "Thurb, im Was. Calif. Bot. ii. 293 (Pleuraphis) Benth. im Journ. Linn. 
Soc. xix. 61. 
Genus naturale et spieul dispositi facile di, d etsi gl forma de specie in 
speciem magnopere variat,nec semper in eadem specie constans. In specie typica, ZZ. cenchroide, 
H. B. et K., glumz exteriores quam in czeteris magis induratz et gluma florens spieule fertilis basi 
breviter dilatsta; 1 in aeumen longum producta insign et florem 9 includit. In Pleuraphi mutica, 
Buckl., glumze exteri late, i i et in hae flos spicule fertilis 9 videtur. In 
P. Jamesii, Torr., flos spiculz fertilis $ est. 
HxxanRnENA, Presl, Rel. Henk, i. 826, £. 45, a nobis non visa, ex ieone et descriptione est plane 
Hilarie species. 
61. zBgopogon, Hwmb. et Bonpl. i Willd. Spec. Pl. iv. 899. (Schellingia, Steud. in 
Flora, 1850, 231, t. 1. Hymenothecium, Lag. Elench. Hort. Matr. Gen. et Sp. Nov. 4.) 
— Spiculee 1-florze, per 2-6 fasciculatso, fasciculis secus pedunculum seu rhachin continuam 
spiez simplicis secundze fere sessilibus dissitis, rhachilla ultra florem non produci, flore 
hermaphrodito. Glum:e 3, apice plus minus 3-dentats, dentibus lateralib 
medio aristiformi v. in aristam producto, 2 exteriores Yhodis, subbreviores, tertia dass) 
variant tamen exteriores v. una sola integerrima acuta, v. omnes apice latiuscul: emar- 
ginatze mutic:, florens ssepius vacuis major, et evidentius J-cuspidata ; palea gluma paullo 
brevior, angustior, 2-nervis, 2-cuspidata. ^ Stamina 3. Styli distincti, stigmatibus 
plumosis. Caryopsis oblonga, glumis inclusa, fasciculo toto spieularum demum articu- 
- Jatim deciduo.— Gramina diffusa v. csspitosa, tenuia, foliis angustis planis. Spicularum : 
fasciculi secus peduneulum secundi, demum penduli, haud raro spiculas 1-3 tenues 
steriles v. ananthas cum fertil ibus mixtas continent. 
4c2 
