PLANTS OF SOUTHERN NEW JERSEY. 329 



//. Leaves terete, channeled along the upper surface. 

 g. Capsule not longer than the perianth. 



/. dichotomus, p. 331 

 gg. Capsule distinctly longer than the perianth. 



J. greenii, p. 331 

 dd. Flowers without individual bracts, collected in heads, leaves 

 flat. 

 e. Stamens exserted in fruit, plant 4-10 dm. high. 



/. aristulatus, p. 332 

 ee. Stamens not exserted in fruit, plant 2-7 dm. high. 

 /. Perianth plainly exceeded by the capsule. 



/. greenii, p. 331 

 //. Perianth not exceeded by the capsule. 



/. margiiiatus, p. 332 

 cc. Leaf-blade hollow terete, and provided with septa at regular 

 intervals. . 

 d. Stamens six, one opposite each part of the perianth. 



e. Heads containing i or rarely 2 flowers. /. pelocarpus, p. 2>3o 

 ee. Heads containing 2 to many flowers. 



/. Epidermis rough with minute tubercles. 



/. ca:sariensis, p. 334 

 ff. Epidermis smooth. 



g. Plants with submerged capillary leaves in addition 

 to the normal ones. /. inilitaris, p. 333 



gg. Plants without capillary leaves. /. articulatus, p. 334 

 dd. Stamens three. 



e. Capsule obtuse or acute, not subulate pointed. 



/. canadensis, p. 335 

 f. Seeds large, 1-1.8 mm. long. 

 ff. Seeds 0.4-0.5 mm. long. 



g. Tip of capsule exceeding the calyx. /. debilis, p. 2)2)'^ 

 gg. Capsule shorter than the calyx. /. aciiminatus, p. 336 

 ee. Capsule tapering to a slender subulate point. 



/. scripoides, p. 335 

 aa. Plant somewhat hairy, leaf sheaths closed. Juncoides cantpestre, p. 336 



JUNCUS L. 

 Juncus effusus L. Common Rush. 



PI. XXXL, Fig. 4. 

 Juncus effusus Linnaeus, Sp. PL 326. 1753 [Europe]. — Knieskern 33.— 



Willis 65. — Britton 249. 

 Juncus conglomeratus Barton, Fl. Phila. L 170. 1818.— Britton 249. 



Common in swamps throug-hoiit the State. 



This is probably the most familiar species of Juncus, easily 

 distinguished from the other common species by its lateral, more 

 or less congested, inflorescence. 



Full-grozvn Capsules. — Mid-June to mid-July. 



