PLANTS OF SOUTHERN NEW JERSEY. 329 



ff. Leaves terete, channeled along the upper surface. 

 g. Capsule not longer than the perianth. 



/. dichotomus, p. 331 

 gg. Capsule distinctly longer than the perianth. 



/. 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 

 ff. Perianth not exceeded by the capsule. 



/. marginatus, 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>2>2 

 ee. Heads containing 2 to many flowers. 



f. Epidermis rough with minute tubercles. 



/. ccesaricnsis, p. 334 

 ff. Epidermis smooth. 



g. Plants with submerged capillary leaves in addition 

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



gg. Plants without capillary leaves. /. articv.latus, 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. 336 

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

 ee. Capsule tapering to a slender subulate point. 



/. scrip oides, p. 335 

 aa. Plant somewhat hairj-, leaf sheaths closed. Juncoides campestre, p. 336 



JUNCUS L. 



Juncus effusus L. Common Rush. 



PI. XXXI., Fig. 4. 



Juncus effusus Linnaeus, Sp. PI. 326. 1753 [Europe]. — Knieskern Zi- — 



Willis 65. — Britton 249. 

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



Common in swamps throughout 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. 



