M0I3-0C0TYLED0N"0US OR ENDOGENOUS PLANTS. 585 



flowers; perianth of 3-6 (rarely 12-20) hispid or plumose 

 bristles, occasionally wanting; stamens mostly 3; style 

 2-cleft; nut lenticular or globose, crowned with the dilated 

 and persistent base long as the nut. — Var., globularis. 

 Smaller (6-15' high) ; corymhs reduced to few globose- 

 ovate dark-brown clustered spikes; nuts smaller, and 

 deeper furrowed. Low ground. June and July. 



R. PUNCTATA, Ell. Culms (l°-2° high) slender, 3-angled ; 

 haves short, linear-lanceolate; corymbs 3-4, cluster-like, 

 the lateral ones simple, distant, and long-peduncled ; spikes 

 ovate; nut obovate, compressed, with transverse pitted 

 furrows, rather shorter iha:i the 6 slightly hispid bristles; 

 tubercle conical, compressed, shorter than the nut. May 

 and June. 



* Nut smooth and even ; bn^tles hispid vijward. 



R. CILIATA, Vahl. Culms blunt-angled (l°-2° high); 

 leaves short, glaucous, linear-lanceolate, obtuse, fringed on 

 the marghis; corymbs mostly solitary, capitate; spikes 

 light brown, ovate; nut oval, lenticular, minutely rough- 

 ened ; tubercle flat, conical ; bristles 6, | the length of the 

 r\\\t\ stamens^. Wet pine-barrens. June-August. Leaves 

 2-4' long; lateral corymh (when present) remote. 



** Nut smooth and even ; b)istles hispid d&wiiward. 



R. ALBA, Vahl. Culms (l°-2° high) slender, 3-angled 

 above; leaves narrowly linear or setaceous; corymbs mostly 

 2, capitate, white, turning brownish, the lower one long- 

 peduncled ; spikes ovate-lanceolate, 1-flowered ; 7iut obo- 

 vate, lenticular, twice as long as the compressed subulate 

 tubercle; bristles 10-20, rigid, as long as the nut and 

 tubercle, ciliate at the base. Wet springy places. August 

 and September. 



CERATOSCHCENUS, Nees. Horned Rush. 



Spikes few-flowered; scales loosely imbricated, the lower 

 ones empty, the upper with staminate or abortive flowers ; 



25* 



