OF ARTS AND SCIENCES. 299 



Besides A. Avicennje, which is more or less naturalized in the 

 Atlantic States, I count A. Indicu.m, var. hirtum, of Grisebach, as a 

 chance introduction from the West Indies into the southern parts of 



racemose : pubescence minute and stellular and above with some simple soft- 

 hirsute hairs, viscidulous. 



A. LANCEOLATA, Hook. & Am. Bot. Beech. 411, from the western side of Mex- 

 ico, is nearly related to the following. It has the back of the mature carpels 

 similarly but more delicately clathrate-reticulate, the epidermal epicarp appar- 

 ently not separating, seed hispidulous-scabrous, and petals 9 lines long. 



A. Wrightii, Gray, PI. Wright, ii. 22. New Mexico, Wright ; Mexico, Schaff- 

 ner. This, having been received from the Berlin Botanic Garden under the name 

 of ^. parvi flora, was taken for that species in Watson's Bibl. Index, and in Proc. 

 Am. Acad. xvii. 330; but it will be shown that it is not the plant of Cavanilles. 

 The dorsal portion of the 8 to 10 carpels is bilamellar at maturity, the endocar- 

 pial layer is not unlike that of A. triangularis, but larger and more clathrate- 

 reticulate, loosely half enveloping the barely puberulent seed. 



§ 2. SiDANODA. Seed more or less suspended in the 5 to 10 barely umbonate 

 merely puberulent carpels of the moderately or hardly depressed fruit, destitute 

 of endocarpial coating : flowers small : pubescence mostly fine and stellular, no 

 bristly hairs. 



» Corolla blue to bluish-white : calyx deeply cleft, rotately spreading under the 



depressed fruit. 

 A. ACEKiFOLiA, DC. Prodr. i. 459. Sida hastata, Sims, Bot. Mag. t. 1541. 

 Mexico. If I correctly refer to this species no. 78 of Parry & Palmer's Mexican 

 collection (which has the general aspect of a small flowered A. hastata, except 

 as to pubescence of herbage and fruit), the species is distinguished from the 

 following by the mainly axillary and larger flowers, the petals nearly half an 

 inch long, perfectly glabrous seed, and thinner carpels destitute of nerves. I 

 have seen only immature fruit. 



A. Thurberi. Slender, a foot or two high, green and barely puberulent or 

 glabrate below ; the calyx, &c., puberulent-canescent : lower leaves cordate and 

 dentate, upper hastate: flowers mostly paniculate racemose : petals only 2 or 3 

 lines long : carpels 8 or 9, the whole dorsal and thickish apical portion strongly 

 3-nerved (or the nerves confluent near the base) : seed puberulent. — S. Arizona, 

 Thiirber, Wright, Lemmon. Ciiihuahua, Mexico, Pringle, 288, distributed as 

 "A. parvijlora, var. 1 " To this belongs part of the specimens taken for a 

 depauperate form of A. hastata, in PI. Wright, ii. 23; also the plant referred to 

 in PI. Thurb. 308. 



* * Corolla yellow, sometimes changing to pink in fading : calyx shorter and 

 less deeply cleft, ascending or appressed to and seldom surpassing the little 

 depressed fruit; its carpels (and closely enwrapped seed) nearly vertical, the 

 inflexed apical portion short: plants paniculately branched and racemose- 

 flowered, stellular-pubescent.. 



A. PENTASCHiSTA, Gray, PI. Wright, ii. 22. Slender, a foot or two liigh, mi- 

 nutely puberulent and more or less cinereous : lower leaves ovate or subcordate, 

 Boniewhat 3-lobed; upper hastate or lanceolate, uppermost linear: calyx 2 lines 



