HOFFMANN: FLORA OF BERKSHIRE COUNTY. 239 



e'. Auricles at the summit of the sheaths not conspicuously extended 

 beyond the' point of insertion. 

 Bracts shorter than the cymes, flowers 2.5 to 3.5 mm. long, scat- 

 tered and secund along the ascending or incurved branches, 



plant of dry soil, infrequent /. secundua. 



Bracts (or at least the lowermost) exceeding the cj-rnes; flowers 

 mostly larger, not conspicuously secund, plant chiefly of moist 



' ^ places, common /. Dudleyi. 



d'. Base bulbous and stoloniferous, leaves linear /. marginatus. 



Leaves hollow, nodulose, i. e., with divisions at regular intervals which 

 show as dark transverse lines. 



/. Seeds with definite caudate tips. 



g. Flowers with the mature fruit about 2.5 (rarely 3.5) mm. 

 long; sepals obtuse; seed ellipsoid, barely 1 mm. long, with 



very short tails /. brachycephalus. 



g'. Flowers with mature fruit about 4 mm. long; petals atten- 

 uate, acute; seed spindle-shaped, with conspicuous tails. 

 Inflorescence one-third longer than broad; capsule equalling 



or slightly exceeding the calyx /. canadensis. 



Inflorescence elongate; strict and narrow, 3 to 6 tunes longer 

 than broad; capsule much exceeding the calyx. 



J. brevicatidatus. 

 f. Seeds merely pointed, or blunt, not caudate. 



h. Stamens 3 j. acummatus. 



h'. Stamens 6. 



i. Upper cauline leaves bladeless (or essentially so), con- 

 sisting of firm tawny or colored sheaths 2.5 to 5 cm. 

 long; the middle leaf erect, much overtopping the 



inflorescence; rare /. niilitaris. 



i'. Upper cauline leaves with blades, or if bladeless, very 

 small. 



j. Flowers soUtary, or in 2's /. pelocarpus. 



j'. Flowers more numerous, in glomerules. 



k. Glomerules spherical; sepals subulate; capsules 

 subulate or lance-subulate; involucral bract 

 usually exceeding the inflorescence. ./. nodosiis. 

 k'. Glomerules hemi.spherical; sepals blunt or acumi- 

 nate, at most mucronate-tippcd; capsules ovoid 

 or ellipsoid; involucral bract much shorter than 

 the inflorescence. 

 Flower brown or brownish; capsule dark brown, 

 3 to 4 mm. long, gradually tapering to the 



mucronate tip J. nrticulatus. 



Flower greenish; cai)sule pair brown, 2.5 to 3 mm. 

 long, abruptly mucronate. 



J. articulalwt, var. obtiuiatus. 



