SCROPHULARIACE^. 261 



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

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

 fiolored, yellowish-while and blue. Early CoUinsia. 



5. CHELONE. Linn.— Shell Flower. 



(From the Greek x^^^"^) 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 Gar. W. to 3Iiss. Aug.— Oct. %.—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 ■Kevre^Jive, and aTr^jioiv, 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. po.ibescens 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 12—15 inches 

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

 panicles. Pubescent Pentstemoii. 



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

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

 Clielone Pentstemon Walt. P. p^ibescens Benth. in D. C. 



Low grounds. Penn. to Flor. June. %. — Stem 1 — 2 feet high. Flowers 

 in terminal panicles. Smooth Pentstemon. 



IV. Gratiole^. 



7. MIMULUS. Z/^7^7^.— Monkey Flower. 



(From the Greek f«i//w, 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 ; low^r lip 3-lobed, 



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



celled, manv-seeded. Seeds minute. 



