418 MISC. PUBLICATION 243, U.S. DEPT. OF AGRICULTURE 
ive  ROTPLBORELTAMN HS Nov. Gram .G.enes 22hai ol nlene manne 
Amoen. Acad. 10: 22. 1790 
Spikelets awnless, in pairs at the nodes of a thickened articulate 
rachis, one sessile and perfect, the other pedicellate, sterile; rachis- 
joints hollow above, the thickened pedicel adnate to it, the pedicel- 
late spikelet appearing to be sessile; sessile spikelet fitting closely 
against the concave side of the rachis-joint, the first glume coriaceous, 
the second less coriaceous; sterile and fertile lemmas and palea 
hyaline. Coarse branching annual with broad flat blades and sub- 
cylindric racemes, dwindling toward the summit and 
bearing abortive spikelets only. 
1. Rottboellia exaitata L. f., Sup. Pl. 114. 1781. 
India. 
Mamsuris exaltata Kuntze, Rev. Gen. Pl. 2: 779. 
1891. 
Stegosia exaltata Nash, N. Amer. Fl. 17: 84. 1909. 
A stout branching leafy annual with hispid sheaths, 
long flat scabrous blades, and numerous axillary ra- 
cemes, the summit of these dwindling and _ bearing 
abortive spikelets only (fig. 368). 
A weed in moist soil, in several of the West Indian 
islands, introduced from southern Asia. 
CuBsa: Habana, Léon 2683. Soledad, Mitchcock 
23323. Sancti Spiritus, Léon 847. El Cristo, Ekman 9000. 
JaAMAIcA: Castleton, Ridley 125; Harris 11387. Kings- 
ton, Hitchcock 9257. Bog Walk, Ridley 108; Hitchcock 
9283 (Amer. Gr. Nat. Herb. 238). Hope Gardens, Harris 
11256. Ipswich, AMitchcock 9605. Barican, Hitchcock 
9567. Ewarton, Hitchcock 9462. Gordon Town, Hart 809. 
Haiti: Ennery, HKkman H 2447; Leonard 8822. St. 
Michel de l’Atalaye, Leonard 7362, 7834. Plaisance, 
Leonard 9270. San Rafael, Cook, Scofield, and Doyle 
152, 153. 
I He Dominican Repusuic: Azua, Ekman H 13618. 
I LEEWARD ISLANDs: St. Kitts, Box 135. 
Rottboellia ex- TRINIDAD: Icacos, Broadway 4965. Point-a-Pierre, 
(higig). | Broadway, 4943. Port-of-Spain, Hitchcock 9944. With- 
out locality, Bot. Gard. Herb. 3221. 
118. MANISURIS L., Mant. Pl. 164. 1771 
Spikelets awnless, in pairs at the nodes of a thickened articulate 
rachis, one sessile and perfect, the other pedicellate rudimentary 
(developed but sterile in M. altissima), the pedicel thickened and 
appressed to the rachis, the sessile spikelet fitting closely against the 
rachis (sometimes partly adnate in VM. altissima), forming a cylindric 
or flattened raceme; glumes mostly obtuse, the first coriaceous, 
fitting over the hollow containing the spikelet, the keels winged at 
the summit, the second less coriaceous than the first; sterile lemma, 
fertile lemma, and palea thin and hyaline. Perennial slender, mod- 
erately tall, or tall grasses, with usually numerous glabrous cylindric 
or flattened solitary racemes. 
