22 PAXICAC'E.E. 



Spikelets with 1 or rarely 'Z flowers, usually in pairs, one sessile, 

 the other pedicellate along the slender continuous rachis of the 

 short branches of a long cylindrical spikelike panicle, densely silky 

 with the long hairs surrounding and seated on the spikelets. 

 Glumes 4, all thin, hyaline, and awnless, 'Z outer empty ones usually 

 hairy, the third empty, or rarely enclosing a ilowei', smaller and 

 without hairs; terminal floral glume still smalh'r; palea usually 

 truncate and jagged at the top. Stamens 1-2. Styles united 

 below, distinct above. Grain small, encloseil, not adherent. 



'J'liere are 3 or 4 species widely dispersed in tropical and sub- 

 tro])ical regions of Europe, China, Jaj)an and America. 



In this genus the branches of the panicle are exceptionally in- 

 articulate, approaching Tristeginea.% but the long silky hairs and 

 the very much reduced floral glume and palea retain it in Andro- 

 pogonea?. 



1. I. Braziliensis Trin. Mem. Acad. St. Petersb. (G) 2 : 331 

 (1833). /. randata Chapm. Fl. S. States. Ed. 3, G08 (1889). 



Culms erect, terete, smooth, 30-100-130 cm. high. Ligule 

 short with long hairs at the base; blades 10-30 cm. long, 4-8 mm. 

 wide induplicate. Arm, the upper shorter, often 3-5 cm. long. 

 The dense wliite woolly panicle lO-lo-'iO cm. long, 1.5-2 cm. 

 diani. Spikelets in pairs, densely covered with silky hairs reaching 

 1 cm. from tlie l)ase, emi)ty glumes sub-equal, about 3 mm. long, 

 the tips obtus(! and ciliate, first ovate-lanceolate, and very delicately 

 5-nerved near the base, second lance-oblong and 3-nerved, third 

 glume oval, 2.5 mm. long, smooth, without nerves, delicately 

 hyaline, with a few short hairs above, fourth glume oval, about 1 

 mm. long, smooth and nerveless; i)alea narrower, otherwise like 

 the fourth glume. Stamen 1. Styles united for 1 mm., then 

 distinct, about 4 mm. long. 



Mexico, PriiKjIc 515. Florida. Mexico, "West Indies, Brazil. 



2. I. Hookeri Hupr. ex Anderss. in n<]fvers. Vet. Akad. 

 Stockh. 12:1(J0 (1855). /. caiulnfa Scrilui. Hull. Torr. Club, 

 9 : 8(i (1882). 1. hvvcifoUa Vasey, Hull. Torr. Clul), 13, 2G {l>^^^\). 

 By some distributions of authors incorrectly called /. a run din area L. 



An erect glabrous perennial, 50-120 cm. high. Upper slieaths 



