POLYPETALOUS EXOGENOUS PLANTS. ^61 



RHEXIA. Deer Grass. 



Caly x-ti\he prolonged and narrowed above the ovary, 

 4-cleft; ;je^«/5 4, roundish, deciduous; stamens 8; anthers 

 1-celled, opening by a terminal pore; capsule 4-celled, 

 many-seeded. — Perennial herbs; leaves 3-5-ribbed; flowers 

 cymose, terminal. 



* Anthers long, linear, curving -upward, saccate at the base, and commonly fur- 

 nished with a bristle-like appendage at the insertion of the Jilaments ; flowers 

 purple or whitish. 



R. glabella, Michx. Stem terete, smooth, mostly 

 simple ; leaves lanceolate, sessile, entire or slightly serru- 

 late, thick, smooth, and glaucous ; calyx smooth or bristly ; 

 flowers large, bright purple. Boot spongy; stem 2°-4° 

 high ; leaves sweetish. 



* Anthers short, oblong, erect, not appendaged ; neck of the calyx short. 

 t Flowers purple ; leaves small, ovate or roundish, bristly serrulate. 



R. serrulata, Nutt. Low; stem simple, 4-angled, 

 smooth; leaves smooth above; calyx glandular-bristly; 

 cyme leafy, 1-6-flowered. Stem 2-6' high; leaves and 

 flowers smaller than in the preceding. 



tt Flowers yellow. 



R. lutea, Walt. Stem at length much-branched, 4-an- 

 gled, bristly ; leaves smoothish, bristly serrulate, the lower 

 ones obovate and obtuse, the upper lanceolate and acute ; 

 cymes numerous; calyx short and smooth; ^oz^er^ small. 

 Stem 1° high; petals more persistent than those of the 

 other species. 



47. LOOSESTRIFE FAMILY. Order, Lythrace^. 



Cliiefly herbs, with opposite or whorled and entire leaves, 

 witliout stipules; flowers mostly axillary; m/?/.T tubular, 

 persistent, 4-7-toothed, free from the 2-4-celled ovary; 



