308 PLANTJE NOV^ THURBERIA^'J. 



It may be well to notice that specimens of Ahutilon crispum in this collection, and 

 also of A. Texense, in this and in some of Mr. Wright's specimens, have their foliage 

 beset with the remarkable Uromyces imlclierrima of Berkeley and Curtis, which was 

 originally sent from Texas by Mr. Wright. 



Near Ures in Sonora, Mr. Thurber gathered a specimen of what is probably a 

 variety of Ahutilon Sonorce, Gray, PI. Wright. : but the branches, petioles, &c. are 

 wholly destitute of the long and shaggy hairs of Mr. Wright's plant ; the leaves are 

 not lobed, and the carpels are almost muticous. Future collectors in this region must 

 determine whether these characters are constant. 



Mr. Thurber's collection also contains specimens of the small-flowered Anocla men- 

 tioned under A. hastata in PL Wright. 2, p. 23. Were the petals " ochroleucous " 

 instead of " bluish-white," it would well accord with the A. ^yarviflora, Cav, or A. ere- 

 natijlora, Ort. The carpels are equally few and muticous ; but the ripe fruit is not 

 yet known. 



THURBERIA, Nov. Gen. Malvacearum. 



Involucellum triphyllum, persistens. Calyx cupuliformis, repando-truncatus, ungui- 

 bus petalorum patentium brevior. Tubus stamineus columnaeformis, superne fila- 

 menta plurima filiformia exserens : antherce reniformes. Ovarium triloculare ; loculis 

 6 - 8-ovulatis verticaliter incomplete bilocellatis, semisepto tenui mox in lanam soluto. 

 Stylus terminalis, indivisus : stigma clavatum, elongatum, tricostatum. Capsula coria- 

 cea, trilocularis, loculicide trivalvis ; loculis biseriatim 5 - 8-spermis ; valvis margine 

 lanigeris, medio septa seminifera gerentibus ; columella centrali nulla. Semina obo- 

 vata, angulata ; testa Crustacea, epidermide membranacea tenuissime lanata. Albu- 

 men nullum. Embryo conduplicatus ; cotyledonibus foliaceis nigro-punctatis maxime 

 complicatis radiculam inferam fere includentibus. — Herba elata, speciosa, glabra ; ra- 

 mulis gracilibus floribusque punctis nigricantibus conspersis ; stipulis caducis ; foliis 

 petiolatis tripartitis summisve bifidis vel integris, lobis lanceolatis acuminatis integer- 

 rimis ; pedunculis axillaribus et terminalibus unifloris medio articulatis ; corolla alba 

 post anthesin rosea. 



Thurberia thespesioides. — Sonora ; in a canon, between Cocospera and Barbasa- 

 qui ; October, 1851. — An herbaceous, doubtless perennial herb, 4 to 10 feet high, 

 copiously branched ; the branchlets slender, somewhat angled, marked at the insertion 

 of the leaves by the scars of the stipules, which must be truly caducous, as they have 

 fallen even from the uppermost nodes. Petioles about an inch and a half long, slen- 



