JUNCACEAE (KUSH FAMILY) 



269 



24. J. canad&nsie. 



23. t/". brevieaudatus. 



86. e/! detilia. 



8T. ./: 



Btamens included in fruit. 



Petals ovate or oblong, blunt . ' 48. */; marginalus. 



Petals lance-attenuate, aristate . , . (4S) J. marginat'us, v. aetoaua. 

 Stamona persistent and exserted in fruit . . . . 44. J. ariatulatua. 

 m. Capsules 6-9 mm. long, much exceeding the calyx; flowers 



few, in 1-4 terminal glomerules . . . . 41. e/. aiygiua, v. americanus. 

 3. Leaves hollow, nodulose, i.e. with septa at regular intervals n. 

 n. Seeds with definite caudate tips o. 



o. Leaves papillose-scabrous ; stamens 6 ; seeds 2-3 mm, long . 21. J. asper. 

 o. .Leaves smooth ; stamens 3 ; seeds shorter p. 

 p. Flowers with the mature fl-uit about 2.5 (rarely 8.5) mm. long ; 

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



very short tails . . . 22. J. braehycephalus, 



p. Flowers with mature fruit about 4 mm. long ; petals attenu- 

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

 Inflorescence (when well developed) ovoid or broader, one 

 third longer than broad ; the glomerules many-flowered ; 

 capsule equaling or slightly exceeding the c&lyx. 

 Capsule abruptly short-pointed ; seed 1-1.8 mm. long 

 Capsule gradually tapering to tip ; seed scarcelj» 1 mm. 



long (24) J. canadenais, v. subcaudaUis. 



Inflorescence elongate, strict, and narrow, 8-6 times longer 

 than broad; capsule much exceeding the calyx, gradu- 

 ally tapering ; seed about 1 mm. long . . , . 

 TO. Seeds merely pointed or blunt, not caudate q. 

 q. Stamens 3 r. 

 r. Capsule attenuate to tip or subulate, distinctly exceeding the 

 calyx a. 

 e. Heads 2-7-flowered ; capsule not subulate. 



Mature fruit 3.5 mm. long 



Mature fruit 5 mm. long 



8. Heads densely many-flowered ; capsule subulate. 



Leaves flattened, obscurely septate ; sheaths without 

 auricles at summit ; cyme large, with vridely divergent 



branches and branchlets 



Leaves terete, distinctly septate ; sheaths witb definite auri- 

 cles at summit ; branches and branchlets ascending. 

 Blade of the uppermost leaf much shorter than its 



sheath 



Blade of uppermost leaf much longer than its sheath . 

 r. Capsule shorter than or about equaUng the calyx, if longer, 

 abruptly tipped (not subulate) t. 

 t. Capsule half or two thirds as long as the calyx, tapering 

 gradually to a conic-subulate beak; glomerules spher- 

 ical ; the rigid subulate sepals much exceeding the 

 petals ; rootstock thick, white, horizontal 

 t. Capsule nearly equaling or exceeding the calyx, abruptly 

 tipped; glomerules hemispherical; sepals and petals 

 subequal ; stems tufted or with merely thickened base. 

 Basal leaves abundant, tufted from a thickened base, often 

 elongate and floating, obscurely septate ; stems lax, 

 decumbent or repent, 0.5-2.5 dm. high; petals blunt 27. J. hulboaua. 

 Basal leaves few. erect ; plant erect, 8 dm. or more high ; 

 pet^s acumiuate. 

 Heads 1-50, on ascending -spreading branches; flowers 



3-3.5 mm. long 85. e/^ acuminaiua. 



Heads 200-500, on widely divergent branches ; flowers 



2-2.5 mm. long 38. ./. rohuatua. 



q. Stamens 6 u. 

 u. Upper cauline leaves bladeless (or essentially so), consisting 

 of firm tawny or colored sheaths 2.5-5 cm. long; the 

 middle leaf erect, much overtopping the inflorescence . 28. J. militaria. 

 u. Upper cauline leaves with blades, or, if bladeless, very small ^. 

 ■u. Flowers solitary or in 2'8, often accompanied or replaced by 

 fascicles of small leaves. 

 Stem erect, from a horizontal rootstock; flowers seeund 

 on the branchlets of a loose dichotomous cyme; fas- 

 cicles of reduced leaves confined to the inflorescence; 

 anthers much exceeding the filaments . . .25. J. pelocarpua 

 Stem repent or floating, bearing scattered fascicles of re- 

 duced leaves ; roots tufted ; flowei's 1 or 2 on axillary 

 or subterminal peduncles; anthers about equaled by 



the filaments . 2Q. J. auMilie. 



V. Flowers more numerous, in glomerules w. 

 w. Lower leaves elongate, filiform, fioating, upper stouter ; 

 glomerules raostlv bearing fascicles of small leaves; 



capsule blunt ^ '1' J. Mclboaus. 



w. Leaves uniform, none floating ; glomerules without fasci- 

 cles of leaves x. 



29. tA poln/cephalua. 



34. J. megacephalm. 

 38. J. 8<mpoide8. 



32. J. hrachycarpua. 



