362 APPENDIX. 



Perityse Emoryi, Torr. & Gray, in Emory's Rep. p. 142. On both sides of the Colorado, and 

 west to the mountains. The characters seem to be constant. 



AscLEPiAS (Otaria) subulata, Decaisne in DC. Prodr. 9, p. 571. In the desert ; not uncommon. 

 It occurs also in Lower California. This is the species which, in the botany of Whipple's 

 expedition, we suspected might be A. subulata. We now possess better sj^ecimens, with the leaves, 

 and have scarcely a doubt that it is the species described by Decaisne under that name, notwith- 

 standing the description does not apply in all respects. The stem is erect, 2-4 feet high, straight, 

 simple, or sparingly branched above, either smooth and glaucous, or somewhat pubescent. The 

 leaves are almost filiform, and erect ; the lower ones nearly two inches long. Umbels sometimes 

 solitary, but more commonly several in a terminal panicle, 10-20-flowered ; peduncles. 1-2 inches 

 long, erect ; pedicels 6-8 lines long, and like the peduncles, pubescent. Flowers about as large 

 as in A. variegata. Sepals broadly ovate, acute. Petals (apparently white) ovate-oblong, 

 rather acute, reflexed. Hoods of the crown twice as long as the nearly sessile gynostegium, 

 dilated above, slightly toothed at the summit; horn somewhat exserted. Follicles about 4^ 

 inches in length, narrowly oblong, acute at the base, much attenuated above, smooth and even. 

 (Tab. VII.) 



Sarcostemma heteropiiyllum (Engelm. 3Iss.) : volubile, glabrum ; foliis petiolatis inferioribus 

 lineari-lanceolatis hastatis, superioribus linearibus ; pedunculis glabris elongatis folia superan- 

 tibus ; pedicellis calycibusque pubescentibus ; corolla rotata glabra, margine fimbriata coronas 

 interioris lobis ovato-globosis gynostegii subbreviores. Near Fort Yuma ; August-September. 

 Stem 10-20 feet long. Lower leaves cordate-hastate at the base, 2-3 lines wide, the upper ones 

 merely obtuse at the base, and 1-1^ line wide. Flowers pale purple. This is 1679 of Wright's 

 New Mexican collection. 



Lippia nodiflora, Michx, Fl. 2, p. 15. Alluvial banks of the Colorado; flowering through 

 the summer. The leaves vary considerably in form. Some of the specimens show a transition 

 to. L. lanceolata, 



Nama biflora, Choisy in DC. Prodr. 10, p. 183; var. spathulata, Torr. in Capt. Parke's 

 Rep. California Desert ; flowering through the summer. 



Nicotiana multiflora, Nutt. Plant. Gamb.? On the Colorado and in other parts of California; 

 September. We cannot be sure that this is Nuttall's plant. It is about 2 feet high, minutely 

 pubescent, viscid on the upper part of the stem. The radical leaves are wanting in the speci- 

 mens ; the cauline are 2 inches long, oblong- spatulate entire, clasping and auriculate at the 

 base. Flowers in a loose panicle ; the pedicels 2-4 lines long. Calyx campanulate, the 5-cleft 

 segments lanceolate and nearly equal. Corolla tubular, with a small, somewhat spreading 

 border, about 8 lines long, pale dull yellow. Capsule 2-valved, the valves deeply 2-parted. It 

 seems to belong to the section Kustica of Dunal. 



Phtsalis. Three species were found near Fort Yuma by Major Thomas, but we have laid 

 them aside until we make an examination of all the North American species of this puzzling 

 genus. 



Datura TnoMASii (n. sp.) : annua^ caule erecto (humili) ; foliis ovatis repandis v. sinuato- 

 dentatis glabriusculis ; floribus brevi-pedicellatis ; corolla calyce pentagono acute dentato duplo 

 longiore ; capsula globosa nutante aculeata, aculeis validis pubescentibus. Near Fort Yuma ; 

 Sept. -Oct. Stem 12-18 inches high. Flowers nearly one-third smaller than in D. Stramonium, 

 Corolla white, tinged with purple on the inside, near the summit. Fruit, (without the prickles,) 

 about an inch in diameter. Seeds blackish, tuberculate-rugose. This appears to be difierent 



