6oO PROCEEDINGS OF THE AMERICAN ACADEMY 



rather an annual, with the base indurated, as is common in these dry 

 regions late in the season. Dr. Torrey's fine specimens, from Santa 

 Rosa, Chihuahua, Dr. Bigelow, and Monterey, Edwards and Eaton, 

 accord with Berlandier's. 



** Folia sessilia vel basi attenuata vix petiolata (radix annua) : 



-I- Pube molli sospius pi. m. viscosa cinerea vel hirsutula: sepala (mo- 

 do generis) sursuni dilatata. 



4. N. UNDULATA, H. B. K. Pube molli et hirsutula cinerea ; 

 foliis margine sjepe undulatis, superioribus oblongis basi lata arete 

 sessilibus, inferioribus oblanceolatis deorsum longe attenuatis ; floribus 

 breviter pedunculatis vel subsessilibus plerisque lateralibus ; capsula 

 elongato- sen lineari-oblonga. Var. /3. {Macrantha, Chois. Hydrol. t. 

 2, f. 1) : foliis caulinis basi vix attenuatis ; pedunculis nunc brevibus 

 nunc gracilioribus calyce a^quilongis. — Mexico and S. Texas. To this 

 I refer Berlandier's no. 2116 (the var. ^.), 1095, 1435, 2111, 2120, 

 2195, 2215, 2328, 2525, and some specimens collected by Dr. Gregg. 

 A fragment from California, collected by Mr. Wallace, seems also to 

 be of this species. So is a plant collected at Fort Yuma by Major 

 Thomas, in herb. Torr. 



5. Nama diciiotoma (Chois.): viscoso-pubescens ; foliis spathu- 

 lato-oblongis oblanceolatisve basi attenuatis subsessilibus ; floribus 

 plerisque in dichotomiis sessilibus vel pedunculis calyce dimidio bre- 

 vioribus ; capsula ovato- seu breviuscule oblonga. Hydrolea dicho- 

 toma, Ruiz & Pav. Fl. Per. 3. p. 22, t. 244. —Taking Spruce's no. 

 5802, from the Equatorian Andes, to represent Ruiz and Pavon's 

 plant, with the alar flowers sessile and the corolla not exceeding the 

 calyx, I refer to it Coulter's no. 916 from Mexico, and his no. 463 

 from California ; in both of which the flowers in the forks are some- 

 times nearly sessile, and sometimes short-peduncled, or short-pedun- 

 cled lateral flowers come from the reduction of one fork to a short 

 peduncle ; and the corollas are twice as long as the calyx. But all 

 the species appear to vary in this respect. 



6. N. Sandavicensis (sp. nov.) : pube brevi hirsutula cinerea ; 

 foliis spathulatis deorsum attenuatis ; pedunculis terminalibus de- 

 mumque lateralibus ssepius bifurcatis calyce fructifero longioribus ; 

 capsula ovali. — Sandwich Islands : Oahu, Macrae, Nuttall, Remy, 

 no. 425. Sand-hills of Maui, Dr. Pickei'ing and Mr. Breckenridge. 

 Kauai, Nuttall. Very much branched; the leaves soon revolute, 4-6 



