JUNCACEAE 57 



1. H. reniformis R. & P. MUD PLANTAIN. Leaves cordate or reni- 

 form: flowers 4 /x long. In ponds. Abundant north of Sheffield ; also near 

 Courtney, Lake City, Buckner and Atherton. July-September. 



2. H. limosa (Sw. ) Willd. SMALLER MUD PLANTAIN. Leaves ovate 

 or oval : flowers 5 X/ long. Abundant iu a pond north of Sheffield with 

 the last ; also near Atherton. July-September. 



3. H. dubia (Jacq. ) MacM. WATER STAR GRASS. Leaves linear and 

 grass-like : spathe 1-flowered. Abundant in Hiffner's Lake near Ather- 

 ton. July-September. 



FAMILY 19. JUNCACEAE Vent. 



Rush-like herbs with regular, greenish flowers. Perianth 6-parted. 

 Stamens 3 or 6. Style solitary. Stigmas 3. Ovary superior, 3-celled, 

 or 1-celled with 3 parietal placentae. Capsule many-seeded. 



1. JUNCUS L. RUSH. 

 Perennial or annual herbs with flowers very variously arranged. 



Flowers in sessile apparently lateral panicles. 

 Stamens three. 1. J. effusus. 



Stamens six. 2. J. Balticus. 



Flowers terminal. 

 Leaves not knotted. 



Annual. 3. J. bufonius. 



Perennial. 



Leaf-auricles white, scarious. 4. J. tennis. 



Leaf auricles brownish-yellow. 5. J. Dudltyi. 



Leaves knotted by internal transverse parti- 

 tions. 

 Stamens six. 



Capsule short-pointed. 6. J. Bichardsonianus. 



Capsule subulate-pointed. 



Heads 8-20-flowered. 7. J. nodosus. 



Heads 25-80-flowered. 8. J. TorreyL 



Stamens three. 9. J. acuminatus. 



1. J. eflusus L. Densely tufted, 2-4 high: stems leafless: flowers 

 1 \ ff long, in a diffuse panicle : sepals about the length of the retuse point- 

 less capsule. Along the outlet to the railroad pond at Grain Valley. 

 Probably adventized. June-August. 



2. J. Balticus Willd. 8'-3 high : stems leafless : flowers 2" long in 

 a panicle, I'-SJ' long : outer sepals acute, the inner obtusish, about the 

 length of the strongly mucronate capsule. Of rare occurrence on sand- 

 bars along the Missouri River. June. 



3. J. bufonius L. 3'-9 x high, spreading : leaves narrow : panicle 

 dichotomous, the flowers distant : sepals 2 // -3J // long, acuminate, the 

 outer much exceeding the three inner and the oblong obtuse capsule. 

 Sand-bars along the Missouri River. Rare. May-November. 



4. J. tenuis Willd. V-W high, erect, wiry: leaves narrow: leaf- 

 aurioles scarious, much prolonged beyond point of insertion : panicle 1- 



