246 COMMON CANADIAN WILD PLANTS. 



* * * Stem leafy ; the leaves terete or laterally compreesed, knotted by 

 internal cross-partitions. Panicle terminal, the flowers mostly 

 in heads. 



-- Stamens 6. 



11. J. peloear'pus, E. Meyer. Stems slender and erect, 

 6-18 inches high. Leaves few, thread-like, slightly knotted. 

 Flowers greenish with red, single or in pairs in the forks 

 and along one side of the branches of the panicle, and often 

 with accompanying tufts of leaves. The 3 inner sepals 

 longer than the outer ones, but shorter than the oblong 

 taper-beaked 1-cel.led pod. Seeds obovate, short-pointed. 



12. J, artieula'tus, L. Stems 9-15 inches high, tufted 

 from a short creeping rootstock, with 1 or 2 slender leaves, 

 bearing crowded 3-8-flowered heads in short spreading 

 panicles. Capsule deep-brown. Wet places, Atl. Prov. 



13. J. alpi'nus, Villars, var. insignis, Fries. Stems 

 erect, 9-18 inches high, with 1 or 2 slender leaves. Branches 

 of the meagre panicle erect, bearing numerous distant green- 

 ish or brownish heads of 3-6 flowers each. Outer sepals 

 mucronate or cuspidate, and longer than the rounded inner 

 ones. Pod short-pointed, light-brown. Seeds spindle-shaped. 

 Lake- and river-margins, common. 



14. J. nodo'SUS, L. Stem erect, 6-1 5 inches high, slender, 

 from a creeping slender and tuber-bearing rootstock, usually 

 with 2 or 3 slender leaves. Heads few, 8-20-flowered, and 

 overtopped by the involucral leaf. Flowers brown. Pod 

 slender, taper-pointed, 1-celled. Seeds obovate, mucronate. 

 Common. 



Var. megaeepha'lus, Torr., has large 30-80-nowered 



heads. 



-i- -i- Stamens 3. Seeds tailed. 



15. J. Canadensis, J. Gay, var. eoareta'tus, Engel. 



Stems slender, 9-18 inches high, tufted, bearing 2 or 3 leaves. 

 Panicle somewhat erect, contracted ; the heads 3-5-flowered, 

 deep-brown. Pod prismatic, abruptly pointed, deep-brown. 

 Seeds slender, with short tails. A very late-flowering 

 species. 



Var. longieauda'tUS, Engelm., is taller, and the heads 

 are many-flowered. 



