OF ARTS AND SCIENCES : AUGUST 10, 1864. 351 



Fructus manifeste in pedicellum clavato-attenuatus vel contractus : 



parvus, parte setniiiifera (l^^ lin.) ovato-pjramidata obtusissima. G. filipes. 

 elongatus, cum pedicello semipoUicaris, apice ssepius pi. m. attenuatus, 



tctraqueter, angulis acutis. G. villosa. 



fusiformis, obtusarj^ulus (maturus vero baud visus), 



cano-puherulus, costis inter angulos validis percursus. G. macrocarpa. 

 glaber, costis angulis alternantibus obsoletis. G. sindata. 



The following synopsis is restricted to the North American species 

 of Gaura. I am unable to complete the monograph by adding the 

 few peculiar to Mexico, no specimens of these being accessible to 

 me. 



GAUR^ BORE ALI- AMERICANS. 



§ 1. Antherce lineares sen lineari-oblongcB (in G. angustifolia tantum 

 hrevi-ohlongce)^ supra hasim ajffixcB ; appendices jilamentorum 

 squamceformes vel subulatce: stigmata ultra indusium exserta. 



* Fructus sessilis vel subsessilis. 



•ir- Fructus tetra- {quandoque tri-) queter, vix ac ne vix attenuatus. — 

 Biennes vel annuce {nunc perennes?), caulibus elo7igatis virgatis, 

 bracteis caducis. 



■*-*■ Rhachis fructu delapso hand dentata vel squarrosa, cicatricibus 

 parvis. Fructus ad latera Icevis. Appendices staminum parv<e 

 vel parvulce. 



1. G. LiNDHEiMERi, Engelm. & Gray (PI. Lindh., 1. p. 9) : strigoso- 

 pubescens vel hirsuta, grandiflora ; calyce in albastro crinito-piloso, 

 segmentis tubo quadruplo longioribus ; stylo basi piloso; fructu ob- 

 longo acutato glabro, angulis acutissimis, faciebus usque ad medium 

 acute unicostatis. — Texas. — Petals nearly an inch long. 



2. G. BIENNIS, L. Caule villoso-pubescente ; calycis segmentis tu- 

 bum adffiquantibus, fauce cum basi styli leviter pilosa ; fructu velutino- 

 pubescente basi obtusangulo inter angulos usque ad apicem unicostato. 

 — Canada to Georgia, and Missouri to Texas. 



3. G. LOKGiFLORA, Spach ? (Monogr. Onagr. p. 60) : molliter 

 subcinereo-puberula ; ramis gracilibus ; calycis segmentis tubo duple 

 longioribus ; stylo basi glabella ; fructu parvo ovoideo vel obovoideo 

 canescenti-puberido obtusiusculeangulato. — Texas to Louisiana (Drum- 

 mond) and Mississippi (Dr. Crockett). — A tall species, like G. bi- 

 ennis. Flowers larger than in the following species, but fruit much 

 smaller, only 1^ to 2 lines long. It in no wise deserves the name 



