OF ARTS AND SCIENCES. 



137 



without iuvolucreor iuvolucels ; rays numerous, 1 to 1^ inches luii" in 

 fruit ; pedicels 2 or 3 lines long : fruit 3 or 4 lines long, oblonji-, the 

 carpels narrowed at each end and beaked by the stout erect stylophove 

 and style, acutely angled by the thin prominent ribs ; vittse quite varia- 

 ble, 1 to 3 in the broad intervals and usually 2 on the narrow com- 

 missure ; the deep sulcus very narrow. — On hills at liio Hondo, State 

 of Mexico; August, 1890 (u. 3G20). 



CiiOMELiA Pringlei. A Small tree (15 feet high); branchlets pu- 

 bescent with short spreading hairs : leaves oblong-ovate, rounded at 

 base, short-acuminate, finely pubescent beneath, slightly scabrous 

 above, 1^ to 3 inches long, on petioles 1 or 2 lines long: peduncles 

 slender, G to 12 lines long; flowers few, sessile or nearly so, subcapi- 

 tate or in a very small loose cyme ; calyx pubescent, equally toothed, 

 scarcely a line long ; corolla reddish, 3 or 4 lines long, rather broadly 

 tubular and but slightly dilated above, the lobes appressed-pubes- 

 cent, a line long : fruit compressed-oblong, sjuirsely pubescent, 3 

 lines long. — In Tamasopo Caiion, San Luis Potosi; August, 1890 

 (n. 3209). 



Crusea megalocarpa. {Spermacoce megalocarpa, Gray, Proc. 

 Am. Acad. 21. 381.) Collected by Mr. Pringle in the barranca near 

 Guadalajara; September, 1889 (u. 2968). This species was referred 

 by Dr. Gray to the section Borreria of Spermacoce, but the charta- 

 ceous cocci separate from a persistent septum which is cleft nearly to 

 the middle and crowned by the persistent linear-lobed calyx-limb. It 

 therefore accords perfectly with Crusea as that genus was character- 

 ized in De CandoUe's Prodromus and by Bentham & Hooker in the 

 Genera Plantarum. The " calycis limbi lobi persistentes " of the lat- 

 ter is criticised by Dr. Gray, and rightlj^ if it were to be understood as 

 meaning that the calyx-limb is persistent upon the cocci. It always 

 separates from the cocci, and may either remain persistent upon the 

 persistent axis, as is the statement of De Candolle, or break away 

 from this also, as in C. svhulata and some other species. 



Edpatorium Madrense. Branches woody, slender and lax, the 

 branchlets finely pubescent, leafy : leaves opposite, small (an inch 

 long), very shortly pedicellate, ovate-lanceolate, acute, rounded or 

 subcordate at base, 3-nerved, serrate except toward the apex, roughish 

 above, tomentose beneath : heads few (3 to 6), terminal and axillary 

 on short peduncles, many-flowered, narrow below, 4 lines high ; invo- 

 lucre 3 lines long, shorter than the disk, its unequal scales in several 

 series, nerved, subtomentose, acute, the outermost narrowly ovate, the 

 innermost linear : achenes slightly hispid toward the base on the acute 



