342 ENDOGENOUS PLANTS 



bulb mostly deciduous. Culms cespitose, compressed, or triangular, 

 leafy at base ; umbel involucrate ; spikelets ferruginous. 



t Style bifid, and akene lenticular. 



1. F. laxa, Vahl. Culm somewhat compressed, grooved ; stamen 

 single ; akene ribbed, and transversely striate. 



Scirpus Baldwinianus. Schultes. $ Fl. Cestr. ed. 2. p. 18. 



LOOSE FlMBRISTYLTS. 



Annual. Culms 4 to 12 inches high. Leaves about as long as the culm (some- 

 times much shorter), narrow-linear, striate, finely serrulate ; sheaths pubescent at 

 throat. Involucre about 3-leaved, one of the leaves longer than the umbel. Umbel 

 mostly simple; rays few, about % of an inch long, sometimes divided. Akene 

 plano-convex, obovate, whitish. 

 Hab. Moist places; Serpentine rocks : frequent. FL Aug. Fr. Sept. 



1 1 Style trifid, and akene triquetrous. 



2, F. autumnalis, Roemer $ Schultes. Culm much compressed ; 

 leaves grass-like; stamens 2, or 3; akene smooth, or minutely 

 verrucose. 



Scirpus autumnalis. L. $ FL Cestr. ed. 2. p. 19. 

 AUTUMNAL FIMBRISTYLIS. 



Perennial ? Culms 2 or 3 to 12 inches long, spreading, flat and two-edged. 

 Leaves shorter than the culm, serrulate near the apex. Involucre of 2 or 3 unequal 

 leaves, the longest about the length of the umbel. Umbel usually decom- 

 pound, or subpaniculate, the spikelets somewhat 4-sided ; often in threes at the 

 and of the branches, or rays. Akene trigonous-obovoid, whitish. 

 Hab. Sandy swamps, and low grounds : frequent. Fl. July. Fr. Sept. 



3* F. capillaris, A. Gray. Culm sulcate-angular, setaceously 

 slender ; leaves setaceous ; stamens 2 ; akene transversely rugose. 

 Scirpus capillaris. L. $ Fl. Cestr. ed. 2. p. 18. 

 HAIR-LIKE FIMBRISTYLIS. 



Annual. Culms 4 to 8 or 10 inches high, 3- or 4-angled, densely cespitose. Leaves 

 much shorter than the culm ; sheaths hairy at throat. Involucre of 1 or 2 seta- 

 ceous leaves, one of them often longer than the umbel. Umbel of 2 or 3 rays, 

 which are about half an inch in length, and 1 or 2 sessile spikelets. Akene trique- 

 trous, white. 

 Hab. Sterile soils; slaty hills: not common. Fl. July. Fr. Aug. 



TRIBE 3. RHYNCHOSPORE V AE. 



Flowers perfect, or polygamous ; spikelets mostly few-flowered, with the bracts (or 

 scales) irregularly imbricated, the Imver scaUs empty, and the upper ones often 

 sterile; perigynium consisting of hypogynous bristles (or sometimes wanting); 

 akene corrugated, beaked with the base of the style, or crowned with an articulated 

 tubercle. 



464. RHYNCIIOS'PORA, Vahl. 



fGr. Jfhynchos, a beak, and Spora, seed; alluding to the beaked akene.] 

 Spikelets lance-ovoid, few- or several-flowered, the upper scales 

 usually with imperfect flowers. Feriyynium mostly of 6 (sometimes 

 more) bristles. Stamens mostly 8. Style bifid. Akene lenticular, 

 crowned with the dilated (tubercular) persistent base of the style. 

 Perennials: culms more or less triangular, nodose and leafy; spike- 

 lets in terminal and axillary cymose clusters, or heads. 



