252 PROCEEDINGS OF THE AMERICAN ACADEMY 



11. P. Stellaiua, n. pp. Glaberrima, easspitosa, basi subperen- 

 nante; foliis angusto-linearibus rigidulis, superioribusbasi parum ciliatis; 

 pedunculis plerumque unifloris elongatis ; corollas " pallide cocrulea3 

 nunc fere albas" lobis apice in segmenta brevi-oblonga bifidis. — 

 " Cliffs of Kentucky River (probably above Lexington), in the fissures 

 of the most precipitous rocks," found only by the late Dr. Short, 

 May 1, 1829. The station should be rediscovered. Flowers as large 

 as those of the foregoing species. Named from the resemblance to a 

 Stettaria both in foliage and blossoms. 



§ 2. Subulatce, Suffrutriculoso-perennantes, Cis-Missisippiance, sem- 



pervirentes, uni-biovulatas ; foliis fasciculatis ; corollas lobis tantum 



obcordatis. 



(P. procumbens, Lehm. Ind. Sem. Hamb. 1828 ; Sweet, Brit. Fl. 



Gard. n. ser. t. 7 — referred by Bent ham to P. subulata var. latifolia, 



— in some specimens nearly approaches P. subulata, in others is more 



like P. amcena, for which in Manual, ed. 5, I mistook it. It is unknown 



as an indigenous plant, and is probably a hybrid of the two species 



above mentioned.) 



12. P. subulata, L. P. subulata & P. setacea, L. Chiefly with 

 long style and solitar}' ovules. — P. nivalis, Lodd. Bot. Cab. t. 780; 

 Sweet, Brit. Fl. Gard. t. 185 ; form with short style, ovules com- 

 monly, but not always, in pairs (rarely 3) in each cell, and corolla 

 white. P. aristata, Lodd. 1. c. t. 1731. P. Hentzii, Nutt., with 

 white corolla, its lobes entire or nearly so, short style, and, in Nuttall's 

 specimens, solitary ovules. — Dry open ground, New York to Michigan 

 and Florida. 



§ 3. Occidentals (transmontanas et montanas), suffrutescentes vel 

 suffruticulosas, raro a basi usque herbaceas, uni-triovulatas ; ramis 

 uni - paucifloris ; foliis plerumque angustis vel parvis margine 

 saspius pi. m. cartilagineo-incrassatis. Species difficillimas ut vide- 

 tur inosculantes. 



* Pulvinato-ccespitosce, suffruticuloso-perennantes, sempervirentes ; 

 foliis brevibus nunc minimis usque ad flores solitarios (sessiles, in 

 postrema nunc brevi-pedunculatos) confertis imbricatisve ac fas- 

 ciculatis basibus scarioso-connatis, vetustis marcescentibus ; ovulis 

 solitariis. Species a minimis imbricatifoliis ad laxiores patenti- 

 folias ordinate. 



-i— Folia saltern ad margines pilis arachnoideis instructa, 



