106 Kayisas Academy of Science. 



Family 37. Juncace^e. Rush Family. 

 Erect perennial, rarely annual, tufted, grass-like herbs, growing in 

 water or wet places. Roots fibrous; stems jointless, terete, often hollow; 

 though normally filled with spongy tissue, the large hollow places filled 

 with septa and carrying much air. Leaves invariably without laminae, 

 transformed into laminodia typically terete and cellular, occasionally 

 merely channeled on the upper surface, often dorsally compressed, without 

 caringe; sheaths with edges free and lapping; ligule none; leaves rarely re- 

 duced to phyllodia. Flowers small, actinomorphous, hypogynous, persistent, 

 with or without prophylla (bractlets). Stamens three or six, in one or two 

 whorls; anthers bisporangiate, adnate, introrse, dehiscing by a slit. Style 

 single, short; stigmas three, filiform. Pistil superior, tricarpous; ovulary 

 trilocular, or unilocular by the placenta?, which are parietal, not reaching 

 the axis. Ovules three to many, ascending, anatropous. Fruit a three- 

 valved, loculicidal capsule. Seeds three to many, small, cylindrical, with 

 caruncular appendages. Embryo minute at base of fleshy albumen. 



584. Juncus effusus L. Rush. ' Swales along the Arkansas river, Barton 

 to Sedgwick county, and elsewhere; 2-13 dm. high; common. May. (S). 



585. Juncus bufonius L. Toad Rush. Damp open ground, E. K. ; 2 dm. 

 high, branching low; common. June. (S) 



586. Juncus tenuis Willdenow. Door-yard Rush. Tufted, 2-6 dm. high; 

 very common in most places where somewhat tramped by people. June. (S) 



587. Juncus interior Wiegand. Prairie Rush. Prairies, general; 4-9 

 dm.; not common. June. (S) 



583. Juncus dudleyi Wieg. Auricled Rush. Damp calcareous soil, N. 

 E. K. ; 3-10 dm.; not common. June. 



589. Juncus littoralis (Engelm.) Salt-marsh Rush. Saline marshy 

 shores, Washington county to Stafford, and southwest; 3-12 dm.; frequent. 

 June. (S) 



590. Juncus marginatus Rostkova. Grass-rush. Moist sandy grassy 

 places, E. K. ; 2-7 dm. high from branching rootstocks; common. July. (S) 



591. Juncus aristulatus Michaux. Beardy Grass-rush. Wet sandy soil, 

 S. E. K. ; 4-10 dm.; occasional. July. (S) 



592. Juncus setosus (Coville.) Bristly Grass-rush. Similar situations, 

 S. E. K. ; with bristly-tipped acuminate perianth-segments and smaller 

 seeds. Not common. July. 



593. Juncus torreyi Gov. Pompon Rush. Damp sandy soil, C. and S. K. ; 

 4-10 dm. ; frequent. July. (S) 



594. Juncus brachycarpus Eng. Short-fruit rush. Damp soil, S. E. K. ; 

 occasional. 



595. Juncus scirpoides Lamarck. Bulrush-like Rush. Wet sandy soil, 

 S. E. K.; 4-9 dm. ; common. July. (AS) 



596. Juncud acuminatus Mx. Sharp-seed Rush. Water, S. E. K.;3-7 

 dm.; heads numerous; not common. May. 



597. Juncus robustus Gov. Stout Rush. Water, S. E. K. ; 5-11 dm.; 

 heads very numerous and small. Not common. June. (A) 



598. Juncus diffusissimus Buckley. Diffuse Rush. Wet grounds, S. E. 

 K.; 2-6 dm ; heads numerous and small; frequent. June. (S) 



