264 DICOTYLEDONOUS PLANTS. 



nence or spur at the base. Capsule 2-celled, opening at the 

 extremity with minute valves. Didynamia. Angiospermia. 



1. A. elatine Linn. : procumbent, hairy ; leaves alternate, hastate, 

 very entire ; peduncles solitary, axillary, very long. 



HAB. Sandy fields. N. Y. to Virg. July. . Stem 12 feet 

 long. Flowers small, bluish- white. Introduced. ? . 



2. A. linaria Linn. : stem erect ; leaves linear-lanceolate, scattered, 

 crowded ; spikes terminal ; flowers imbricate ; calyx smooth, shorter 

 than the spur. 



HAB. Road sides. N. S. June Oct. 21. Stems 12 feet 

 high. Flowers large, yellow, in long spikes. Introduced. ? 



Snap-dragon. Toad Flax. 



3. A. canadense Linn. : assurgent, smooth, mostly simple ; leaves 

 scattered, erect, linear, obtuse j flowers in racemes ; suckers (or sterile 

 branches) procumbent. 



HAB. Low grounds. Can. to Car. June Aug. 0. Stem G 12 

 inches high, slender. Flowers very small, blue, in a terminal 

 raceme. Flax Snap-dragon. 



6. MIMULUS. Linn. 



Calyx prismatic, 5-toothed. Corol ringent ; upper lip re- 

 flexed at the sides ; palate of the lower lip prominent. Stigma 

 thick, bifid. Capsule 2-celled, many-seeded. Seeds minute. 



Didynamia. Angiospermia. 



1. M. r in gens Linn. : erect, smooth ; leaves sessile, lanceolate, acu- 

 minate, serrate ; peduncles axillary, opposite, longer than the flower ; 

 teeth of the calyx oblong, acuminate. 



HAB. Wet grounds. Can. to Car. W. to Miss. Aug. U- 

 Stem 2 feet high, angular. Flowers large, pale purple. 



Monkey Flower. 



2. M. alatus Linn. : erect, smooth ; leaves petioled, ovate, acuminate, 

 serrate ; peduncles axillary, opposite, shorter than the flower ; teeth 

 of the calyx round, mucronate ; stem square, winged. 



HAB. Wet meadows. N. Y. to Car. Aug. It. Stem 2 feet 

 high, winged. Flowers pale blue. Abundant in the western 

 part of New- York.' Distinguished from the former by its larger 

 and petiolate leaves and winged stem. 



7. GRATIOLA. Linn. 



Calyx 5-parted, often with 2 bracts at the base. Corol tu- 

 bular, sub-bilabiate ; upper lip emarginate ; lower 3-lobed. 

 Stamens 4, 2 sterile. Stigma 2-lobed. Capsule ovate, 2- 

 celled, 2-valved. Diandria. Monogynia. 



1. G. aurea Muhl. : smooth ; leaves linear-oblong, subclisping, ob- 

 scurely toothed ; segments of the calyx equal ; sterile filaments mi 

 nute. G. ojidnaUs Mich. G. carolinicnsis Pers. 



