JUNCACEAE (UUSH FAMILY) 



Stamens Included In fruit. 



Petals ovate or ot>loiiir. blunt 43. J. marginatut. 



Petals lancn-attenuute. aristate . . . (43) J. tnftryintiiini, v. fttomit. 

 Stamens persistent and exserted in fruit . . . . 44. J. arintulatus. 



m. Capsules ti-K nun. long, much exceeding the calyx; flowers 



few, in 1-4 terminal glouierules . . . . 41. J. ttygiun, v. americanun. 



o. 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 2-8 mm. long . 21. J. asper. 

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

 p. Flowers with the mature fruit about 2.5 (rarely 8.5) mm. long ; 

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

 very short tails ..,-.. .... 



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

 ate, acute; seed spindle-shaped, with r<in.pi<-uous 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 . 24. J. canaden*i. 

 Capsule gradually tapering to tip ; seed scarcely 1 mm. 



long (24) J. canadfntis, v. tubcaudatux 



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

 than broad ; capsule much exceeding the calyx, gradu- 

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

 . Seeds merely pointed or blunt, not caudate q. 

 ens 3 r. 



22. J. bracfiycephalvt. 



28. J. brevicavdatus. 



q. Stame 

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



calyx n. 

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



Mature fruit 3.5 mm. long 86. J. df-bili*. 



Mature fruit 5 mm. long 87. J. diffusisitimus. 



t. Heads densely many-flowered ; capsule subulate. 



Leaves flattened, obscurely septate ; sheaths without 

 auricles at summit ; cyme large, with widely divergent 



branches and branchlets . . . . . 29. J. polycephatus. 



Leaves terete, distinctly septate ; sheaths with 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 . 

 T. Capsule shorter than or about equaling 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. bulbovu*, 

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



petals acuminate. 



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

 3-3.5 mm. lon<r 



34. J. megacephalu*. 

 33. J. scirpoiden. 



32. J. bracfiycarpus 



85. J. acuminatvg. 

 88. J. robutdiu. 



Heads 200-500, on widely divergent branches ; flowers 



2-2.5 mm. long 



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. militarit. 



. Upper cauline leaves with blades, or. if bladeless, very small <c. 



v. Flowers solitary or in 2's, often accompanied or replaced by 



fascicles of small leaves. 



Stem erect, from a horizontal rootstock; flowers secund 

 on the branchlets of a loose dichotomous cyme ; fas- 

 cicles of reduced leaves confined to the inflo'rescence ; 

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

 Stem repent or floating, bearing scattered fascicles of re- 

 duced leaves ; roots tufted ; flowers 1 or 2 on axillary 

 or subterminal peduncles; anthers about equaled by 



the filaments 26. J. tubtilit. 



i>. Flowers more numerous, in glomerules w. 

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

 glomerules mostly bearing fascicles of small leaves ; 



capsule blunt J 'jiilbotut, 



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

 cle-i of leaves r. 



