188 



Thalictrum pringlei reticulatum RoBe, var. nov. 



Stums low, 3 to 4.5 dm. high, somewhat pubescent; leaves twice teni ate; leaflets 

 peltate, nearly orbicular, 12 to 40 mm. in diameter, entire nr 3 to 5 angled, puberalent 

 and pah 1 - beneath, dark green and glabrous above, strongly netted-veined ; inflores- 

 cence a narrow terminal panicle; fruiting peduncle nodding; stamens not seen; 

 styles long; akenes glaucous, obliquely lunate, with about 3 lateral nerves. 



Collected by .). N. Rose between Pedro Paulo and San Blascito, in the foothills of 

 the Sierra Madre, Territorio do Tepic, August 4, 1897 (No. 1985). 



T!ie second form is nearer the type than the above. In the toothing of the lealiets 

 it is much like T. pringlei, but the lealiets are not always peltate, and are slightly 

 puborulent beneath, and the anthers have longer apiculations. 



Collected by J. N. Rose between Dolores and Santa Gertrudis, August 7, 1897 (No. 

 3372). 



eo. Leaves 4 or 5 tcrnate ; leaflets small, ovate. 



Thalictrum guatemalense C. DC. «.V Rose, sp. nov. 



Stems to 7 dm. high, rather slender and more or less branched, more or less his- 

 pid; leaves much divided; rachis pilose; leaflets small, peltate, more or less rough- 

 ened on both sides, paler and strongly veined beneath ; akenes turgid, somewhat 

 roughened, less than 1 nun. long. In the National Herbarium we have two speci- 

 mens of this species, both from Guatemala and both distributed as T.peUatum One 

 of these is No. 161, Enrique Th. Heyde, collected in 1892, and the other is Capt. J. D. 

 Smith's No. 791, collected by Rosalio Gomez. 



To this species is to bo referred probably Lecoyor's T.peUatum from Costa Rica. 



aa. Leaflet* not peltate. 



This section of Thalictrum contains about 12 Mexican species. As several species 

 heretofore reported from Mexico must probably bo excluded from its flora, and as I 

 am in doubt as to the best treatment of some of the older species, it seems best to 

 defer for another paper a synopsis of these speeieB. Tho following new species may 

 be described here: 



Thalictrum pachucense Rose, sp. nov. 



Small dedicate plants with long fibrous roots, 2 to 3 dm. high, glabrous through- 

 out; leaves all or mostly basal, small, 1 dm. or less long including the petioles, 

 3-ternate; leaflets small, 5 to 7 mm. long, either broad and cordate or narrow and 

 cuneate at base, pale beneath, glabrous on both sides; pedicels erect in flower, bent 

 at tip in fruit ; flower hermaphrodite; sepals purplish; stamens apiculate; stigma- 

 tose style long and slender; immature fruit glabrous, oblong. 



Collected by Mr. C. G. Pringle in open woods of the Sierra de Pachuca, Hidalgo, 

 altitude 2,700 meters, July 16, 1898 (No. 6880). 

 Thalictrum madrense Rose, sp. nov. 



Glabrous, slender, 1 foot or loss high from a cluster of thickened roots; leaves 

 small, sessile, 1 or 2 ternate ; leaflets mostly 3- toothed or lobed ; flowers dioecious ( ?) ; 

 fertile llowers often axillary and single ; style wanting ; stigma short and thickened ; 

 akenes with strong undulate ribs. 



Collected by J. N. Rose near the top of the west range of the Sierra Madre east of 

 Santa Teresa in tho Territorio do Tepic, August 13, 1897 (No. 2232), and on the west 

 side of the east range in tho State of Durango, August 15 (No. 3505). 



This species is a near relative of T. pinnatum, but differs especially in having ter- 

 uato instead of pinnate leaves. 

 Thalictrum grandiflorum Rose, nora. nov. T. grandifolium Rose, Contr. Nat. Herb. 



5: 113. 1897. Not Watson. 



This species has been distributed as T. grandiflorum, which name it may now bear, 

 since tho name T. grandifolium is a homonym. 



Tho type (Type No. 1513) is in the National Herbarium. 



