SPECIES AND VARIETIES. 329 



the stem below, cylindrical upwards, hollow, but divided inside 

 by cross partitions of pith, which give them the appearance of 

 being jointed; flowers in little clusters, arranged in a com- 

 pound terminal panicle ; perianth-segments all pointed, or the 

 inner ones obtuse; capsule more or less pointed. — Boggy 

 places. Fl. June to August. 



J. obtustflorus differs only from the common larger erect 

 form of /. articulatus in having all the segments of the pe- 

 rianth obtuse or nearly so, and about as long as the very 

 pointed capsule. — INIarshes, rather rare. 



ft Leaoes grooved above, not jointed internally. 



J. compressus : stems I-li foot high, erect, rather slender, 

 with a few nearly radical leaves shorter than the stem, and 

 1-2 higher up, all narrow and grooved ; flowers scarcely clus- 

 tered, in a loose terminal panicle, shining brown ; perianth- 

 segments obtuse ; capsule roundly-ovate, about as long. — 

 Wet marshy places, especially near the sea. Fl. June to 

 August. 



J. bufonius : annual ; stems numerous, forming dense tufts, 

 1-8 inches high, branching and flowering almost from the 

 base; leaves chiefly radical, short, slender, angular, grooved; 

 flowers solitary along the branches, the lower bracts leaf-like ; 

 perianth-segments narrow, pointed, pale-green, with scarious 

 edges; capsule oblong, shorter. — Wet places. Fl. July, Au- 

 gust. 



*** Leaves all radical, numerous. 

 J. squarrosus : leaves all radical or nearly so, short, nume- 

 rous, very narrow, grooved, stiff", spreading ; flower-stem nearly 

 a foot high, rigid, with a terminal panicle ; flowers usually 

 distinct; perianth-segments rather broad, glossy brown, with 

 broad scarious edges. — Moors and heaths. Fl. June, July. 



