SCKOPHULAttlACE^E. 



Banks of streams. Western N. Y. W. to Miss. July. (T). Stem a foot 

 high. Peduncles axillary, 1-flowered, opposite or verticillate. Corolla parti- 

 colored, yellowish-white and blue. Early Collinsia. 



5. CHELONE. Linn. Shell Flower. 



(From the Greek x ^ wt "7, a tortoise; the flower resembling the head of that 

 animal.) 



Calyx 5 -parted. Corolla ventricose-tubular ; upper lip broad, 

 concave, emarginate or shortly bifid ; lower one spreading, 3- 

 cleft. Stamens 4, didynamous, with a fifth shorter sterile fila- 

 ment. Anthers woolly. Capsule 2 -celled, 2-valved. Seeds 

 membranaceously margined. 



C. glabra Linn. : smooth ; leaves opposite, lanceolate or oblong-lanceo- 

 late, acuminate, serrate ; flowers in dense spikes. 



Wet grounds. Can. to Car. W. to Miss. Aug. Oct. 1j-. Stem 2 feet 

 high, simple. Leaves thick and somewhat coriaceous. Flowers large, white or 

 reddish, in compact terminal or subaxillary spikes. Snake-head. 



6. PENTSTEMON. Linn. Pentstemon. 



(From the Greek Kf.vTf,jive, and OTJ^JCOJ/, a stamen ; in allusion to the fifth large 

 abortive stamen.) 



Calyx deeply 5-parted or 5-sepalled. Corolla bilabiate, ven- 

 tricose. The fifth sterile filament longer than the rest and 

 bearded on the upper side. Anthers smooth. Capsule ovoid, 

 2-celled, 2-valved. Seeds numerous, angular. 



1. P. pwbescens Linn. : stem pubescent; leaves lanceolate-oblong, serru- 

 late, sessile, clasping ; sterile filament bearded from the top to below the 

 middle. 



Hill sides. Can. to Flor. W. to Miss. June. %. Stem 1215 inches 

 high, simple or branching. Leaves smoothish. Flowers pale purple, in terminal 

 panicles. Pubescent Pentstemon. 



2. P. Icevigaius Ait. : smooth : leaves ovate-oblong, clasping at base, 

 slightly toothed, the lower entire ; sterile filament bearded near the top. 

 Chelone Pentstemon Walt. P. pubescens Denth. in D. C. 



Low grounds. Penn. to Flor. June. 'ZJ .. Stem 12 feet high. Flowers 

 in terminal panicles. Smooth Pentstemon. 



IV. GRATIOLE^J. 



7. MIMULUS. Linn. Monkey Flower. 



(From the Greek /*/<, a monkey ; in allusion to its grinning-flowers.) 



Calyx tubular, 5-angled, 5-toothed. Corolla ringent ; upper 

 lip 2-lobed, erect or reflexed at the sides ; lower lip 3-lobed, 

 spreading. Stamens 4. Stigma thick, 2-cleft. Capsule 2- 

 celled, many-seeded. Seeds minute. 



