^50 UNITED STATES AND MEXICAN BOUNDARY. 



Ipom(EA muricata {Cav. Ic. 5, p. 52, L 478, / 2, ex Clioisy, I. c. p. 353) : glabra ; radlce 

 tuberosa globosa ; caule prostrate; foliis subsessilibus palmatis, lobls 5-7 inte^-ris ano-uste 



o — -^"t) 



linearibus vel lobo medio lineari-lanceolato ; pedunculis uniflorls brevibus (2-4 Ha.); sepalis 

 lanceolatis obtusiusculis, dorso muriculato ; corolla tiibulosa (unciali purpureo-coccinea) breviter 

 5-loba; capsula glabra. Soaora, Mexico; Tlmrher, September. (No. 1616, Wright.) Boot 

 a roundish tuber from half an inch to an inch or more in diameter. Stem a span long, slender. 

 Leaves about an inch long, most of the segments scarcely half a line wide. Corolla almost 

 trumpet-shaped. 



Ipomcea leptotoma (n. sp.) : annua; caule prostrate (vix volubili) glabro ; foliis petiolatis 

 pedatis glabriusculis, lobis 5-7 linearibus ciliolatis integris, lobo medio elongato ; pedunculis 

 l-2-flori8 petiolo multo longioribus ; pedicellis calycibusc[ue hispidulis ; sepalis lanceolatis, apice 

 attenuatis acutissimis ; corolla campanulato-infundibuliformi (1^ unciali.) Near Santa Cruz 

 valley, Sonora, September; Thurher. (No. 1614, Wright.) Stem branching from the root; 

 the branches 1-1^ foot long, somewhat twining. Petioles 2-4 lines long. Leaves deeply 

 divided in a pedate manner, the lobes scarcely a line wide, the middle lobe usually almost twice 

 the length of the lateral ones ; uppermost leaves often entire. Peduncle 1-2 inches long ; the 

 pedicels scarcely half an inch. Sepals about 4 lines long. Corolla with a bright reddish 

 purple limb and a pale tube. 



Gh 



On the banks and in the bed of the San 



Pedro, Western Texas ; September, (fl. & fr.) ; Bigeloiv. Seems to differ in the sepals being 

 only mucronate and scarcely aristate. 



ALSINOIDES 



Linn, Sp. 392 ; Choisy^ I. c. p. 447. Rocky hills, near Camp Bache, 

 July; Bigelow. Corallitas, Chihuahua, Aug.; and Sonora, Mexico; Thurler. No. 1619, 

 Wrighty is a form with narrow leaves. 



Var. HiRxrcAULis : caule hirsuto, pilis longis patentibus ; foliis ovato-oblongis, obtusiusculis. 

 Brazos, San Jago, Texas, and on the Rio Grande near the San Pedro river, May — September ; 

 Schott. Western Texas, Wright. Monterey, Mexico ; Dr. Edioards. 



Yar. ANGUSTiFOLiA : caule hirsuto, pilis sparsis longis patentibus ; foliis lineari-lanceolatis, 

 acutis. Near the Great Canon of the Rio Grande, August ; Parry. 



EvoLVULUs? OYALiFOLius (n. sp.) I uudique velutino-sericeis ; caule prostrato e basi ramo- 

 sissimo ; foliis ovatis (poUicaribus 6-8 lin. latis) obtusiusculis crassiusculis, basi rotundatis vel 

 subcordatis ; floribus solitariis axillaribus brevissime pedicellatis ; sepalis late ovatis mucronatis ; 



monospermis 



Carlos, October : Parry. Th 



are in fruit only, 



EvoLVULUS HOLOSERiCEus ^3 OBTUSATUS, Chois. L c. E. sericeus, Natt. Gen. 1, p. 174, no7i Sivartz. 

 E. discolor, Benth, PI. Hartiv. p. 6, Rio Grande, near the San Pedro river, and near Yorktown, 

 October ; Schoit. A more densely cespitose form, with shorter branches, occurs near the Copper 

 Mines, June ; Bigelow. Monterey, Neuvo Leon ; Dr. Edivards. Cerralbo ; Gregg. The 

 pubescence, as in the next species, is reddish, at least in dried specimens ; the peduncles are only 

 one-flowered ; the sepals are scarcely two lines long, and the leaves are often more than an inch 

 in length. It may prove to be a distinct species. The peduncles of the early flowers are some- 

 times nearly as long as the leaves, 



EvoLvuLUS AUGENTEUS, Piirsk^ Fl. I, p. 187 ; Choisy, I. c. E. pilosus, Nutt. Gen. lyp. 174, (& 



in Trans. Amer. Phil Soc. n. ser. 5, p. 195, non LamarcTc. E. Nuttallianus, B. d Schult. 

 Gravelly hills, near Rock Creek and Yan Home's Wells, June— July ; Bigelow^ Wright. 

 Coppei Mines, N Mexico ; Thiirher. Chihuahua ; Gregg. It is No. 668 of Fendler's N. Mexico 



f 



i 



