OF ARTS AND SCIENCES. 71 



bibracteolatis pleruraque unifloris nunc geminis ; corolla campanulata 

 fere 5-partita sepalis lanceolatis acuiuiuatis parum longiore, lobis 



a. Corolla reflexa generis : cuculii cornusubulato exserto instructi. 

 1. Colurana sub cucuUis conspicua, antlieris parum dimidlo brevior. 



A. Mexicana, Cav. Ic. i. 42, t. 58. A. fascicularis, Decaisne in DC. A. 

 macrop/ii/!la, Nutt. PI. Gamb. 180. This species, which is common from Oregon 

 to the borilers of Mexico, appears to be identical with specimens collected in 

 the valley of Mexico by Bourgeau (no. (33), and by Ghiesbreght still farther 

 south. The figure in the Icones of Cavanilles very well represents it. 



A. VERTiciLLATA, L. A widely distributed species, including ^4. galioides, 

 HBK., of Me.xico. Var. pu.mila is a singularly dwarf or depauperate form, of 

 the western dry plains, from Nebraska to New Mexico. Var. suBVERriciLLAXA 

 (A. verticillata \a.r. galioides, Torr. Dot. Mex. Bound. 164, chiefly), is a marked 

 form, with single stems, simple or branched, the leaves mostly in pairs and 

 threes, and their margins little revolute, the horns of the hoods rather less ex- 

 serted. Decaisne's A. verticillata var. lini folia may include this ; but it is evi- 

 dently a mixture of A. verticillata (to wliicli the specimens from "Florida and 

 Georgia" mny belong) ; of A. virijala, L;ig. {A anf/astifolia, Roeni. & Scliult. &c.), 

 which, from Kunth's character of opposite leaves and little exserted horn, may 

 be A. UnifoUa, HBK.; and of ^1. Mexicana, Cav. (from which may come the 

 character of leaves 4-6-nate), which must be identical with A. fascicularis of 

 Decaisne. Here also A. linearis, Scheele in Linntea, xxi. 



(A. LiNARiA, Cav , a Mexican species which has been associated with A. vet- 

 ticillnta, differs much in the very short stamina! column, short and almost 

 included horns, and in the ovate follicles becoming erect on the docurved pedi- 

 cel, which is not known to occur in any species of this section.) 



2. Columna brevis crassior. 



A. QUINQUEDENTATA. Facie fere A. verticillatce var. suhverticillntK ; foliis 

 omnibus oppositis angusto-linearibus elongatis; umbellis paucifioris longiuscuhi 

 pedunculatis ; corollas virescenti-alb£e lobis ovalibus (lin. 2|-3 longis) ; cucuUis 

 antlieris aequilongis columna triplo longioribus complicatis, dorso subcarinato, 

 apice truncato grosse argute 5-dentato ; processu falcato ad apicem cucuUi usque 

 adnato ihiqiie bifido, lobo dorsali minimo dentiforiin, ventrali in coriiu suljula- 

 tum inflexum breviter exsertum producto. — W. Texas, on or near the San 

 Pedro River, C. Wright, no. 1689, referred in Torr. Bot. Mex. Bound. 104, to a 

 variety of A. verticillata. It is much more related to the appended Mexican 

 species. 



(A. CoDLTERi. Praecedenti affinis ; foliis oppositis filiformibus ; umbellis 

 3-6-floris ; pedicellis filiformibus pedunculo subaequilongis ; coroUae albse lobis 

 oblongis (lin. 3— t longis) ; cucullis columna crassa triplo longioril)Us antheras 

 aequantibus complicatocorapressis subquadratis dorso carinatis centro solidis 

 apice truncatis subintegris; processu lato-subulato falcato infra apicem cuculli 

 libero integerrimo longius exserto. — Mexico, Coulter, coll. no. 983. Single 

 specimen, in flower: fruit not seen. The horn of the hood springs from a solid 

 central portion, which is winged dorsally by a keel; the ventral part and top 

 bilamellar and open.) 



