DIDYNAMIA ANGIOSPERMIA 369 



299. CHELONE. L. Mitt. Gen. 538. 

 [Greek, Chelone, a tortoise ; the flower resembling the head of that animal.] 



Calyx deeply 5-parted, with 3 bracts at base. Corolla bilabiate, ven- 

 tricose. Stamens with a fifth sterile filament shorter than the rest, 

 smooth above ; anthers lanuginous. Capsule 2-cellcd, 2-valved. Seeds 

 membranaceously margined. 



Herbaceous: leaves opposite; flowers in crowded sub-imbricated terminal and 

 axillary spikes. Nat. Ord. 211. LindL Scbophulakineje. 



1. C. glabra, L. Leaves oblong-lanceolate, acuminate, serrate, 

 smooth, subsessile. Beck, Bot. p. 266. Icon, Bart. Am. 3. tab. 76. 

 Glabrous Chelone. Vulgb — Shell-flower. Snake-head. 



Root perennial. Stem 2 to 3 feet high, obtusely quadrangular, smooth, simple, 

 or sparingly branched. Leaves 2 to 4 or 5 inches long, and half an inch to an inch 

 and half wide, thick and subcoriaceous, smooth above, minutely pubescent be- 

 neath, prominently veined and somewhat rugose, on very short petioles. Flatters 

 sessile, in thick crowded spikes 1 to 2or 3 inches in length. Bracts ovate -oblong, 

 concave, coriaceous, smooth, shorter than the calyx. Calyx smooth; segments 

 deeply divided (almost sepals), oblong, obtuse, concave, subcoriaceous. Corolla 

 white, smooth, ventricose, lips nearly closed (much resembling the mouth of a 



tortoise); upper lip convex or vaulted, lower one villose within on the palate. 



Filaments villose, the fifth sterile one much shorter, smooth at summit; a?Uhers 



woolly. Style longer than the stamens, persistent. Capsule ovoid, bisulcate, 



smooth. Seed* numerous, meiiibranaceously margined. 



Hab. Margins of swamps, and rivulets: frequent. Ft. August— Sept. Fr. Octo. 

 Obs. Two or three other species are enumerated in the U. States : But the 

 C. latt/olia, Muhl. as furnished tome by Mr. Schiocinitz, seems to be very nearly 

 allied to this. 



300. PENTSTEMON. Mitch. Nutt. Gen. 539. 

 [Greek, Pente, five, and Steman, a stamen; from the fifth abortive stamen.] 



Calyx deeply 5-parted (or 5-sepalled). Corolla bilabiate, ventricose. 

 Stamens with a fifth sterile filament longer than the rest, and beard- 

 ed on the upper side ; anthers smoothish. Capsule 2-celled, 2-valved. 

 Seeds angular. 



Herbaceous, or rarely suffruticose : leaves opposite ; flowers paniculate. Nat. 

 Ord. 211. LindL Scrophulaiunejb. 



1. P. ruBEscExs, Ait. Stem pubescent ; leaves lance-oblong, serru- 

 late, sessile, amplexicaul ; sterile filament bearded from the apex to 

 below the middle. Beck, Bot. p. 266. Icon, Bart. Am. 3. tab. 103. 

 Pubescent Pentstemox. 



Root perennial. Stem 9 to 15 inches high, erect, or decimtent, obtusely 

 quadrangular, somewhat tomentose-pubescent, nearly simple, often branching 

 from the base, or several from the root; summit paniculate, glandular-pubescent 

 ana viscid. Leaves2to 4 or 5 inches long, and 1 third of an inch to an inch wide, 

 tapering to the apex, but rather obtuse, mostly narrowed towards the base, sessile 

 and amplexicaul, serrate, or rcpand-demiculate, often nearly entire, smoothish,- 

 the upper ones rather ovatclanceolate and acuminate. Flotcera in a terminal di- 

 or tn-chotomous panicle. Calyx somewhat pubescent ; segments (or rather sep- 

 a •) ovate-lanceolate, acuminate, striate. Corolla palish violet-purple, pubescent, 

 about an inch long; tube contracted below, inflated above ; upper lip shorter, 2- 





