1. Leaflets usually rather thick and rigid, mostly longer than wide, entire to 



usually acutely 3-lobed with the lobes entire; polygamo-dioecious.... 



1. T. dasycarpum. 



1. Leaflets usually thin and flaccid, as wide as long or wider, typically 3-lobed 



with the lobes obtuse to rounded and often notched or crenate; 



dioecious, rarely polygamous 2. T. Fendleri. 



1. Thalictrum dasycarpum Fisch. & All. Purple meadow-rue. 



Caudex short and thick, erect; stem to 2 m. high, often purple; upper leaves 

 sessile or subsessile, their ovate to suborbicular stipules brown; leaflets firm, obovate 

 in outline, to about 55 mm. long and 4 cm. wide, with veins prominent beneath, 

 provided on lower surface with a fine non-glandular pubescence or glabrous, or 

 sometimes glaucous; inflorescences corymbose-paniculate; sepals lanceolate to 

 narrowly ovate, acuminate, commonly slender-tipped, 3-5 mm. long; filaments 

 filiform, 4-7 mm. long, soon drooping and entangling; anthers oblong-linear, 1.5- 

 3.2 mm. long, with subulate tip only 0.1-0.2 mm. long; stigma 2-5 mm. long, 

 about equaling the ovoid to lanceolate body of carpel. 



In meadows, swamps and damp thickets, on rich wooded slopes or along wooded 

 streams in Okla. {Waterfall), the e. third of Tex. and the n. Panhandle, N. M. 

 (San Juan and Sandoval cos.) and Ariz. (Navajo Co.), Mar.-July; from Ont. to 

 Alta., s. to O., Ind., lU., Mo., Kan., La., Tex., N.M. and Ariz. 



The var. hypoglaucum (Rydb.) Boivin {T. hypoglaucum Rydb.) is an entirely 

 glabrous plant with somewhat thinner leaves that are glaucous on the lower surface, 

 often longer stigmas (2.5-5 mm.), longer filaments (4-7 mm.) and a more 

 elongate receptacle than in var. dasycarpum. 



2. Thalictrum Fendleri Engelm. 



Plant always more or less pubescent, rarely subglabrous or even glabrous, never 

 waxy nor blue nor glaucous, the stem sometimes purplish, to 15 dm. high, more or 

 less stoloniferous; sepals erose, the staminate ovate to elliptic and 3-5 mm. long, 

 the pistillate ovate to rhombic or broadly lanceolate and about 1.5 mm. long; fila- 

 ments 4-7.5 mm. long, deep-yellow; anthers oblong to linear, pale- or deep-yellow, 

 2.2-3.4 mm. long, with acumen to 0.8 mm. long; stigma 1.5-4 mm. long; ovary 

 (densely) green, with the ventral surface ovate to lanceolate, often densely pubes- 

 cent; mature carpel spreading, ovate to lanceolate, green to brown, more or less 

 pubescent to sometimes glabrous, with a stipe to 2 mm. long, the ventral surface 

 to 9 mm. long and 4.5 mm. wide, with lateral nerves rarely branching and sinuate, 

 never minutely sinuate nor anastomosing nor reticulate, with the nerve curved 

 ventrally rather than dorsally. 



On moist shaded canyon slopes, muddy seepage banks, edge of streams, and in 

 wet meadows and thickets in mts. of the Tex. Trans-Pecos, N. M. (rather wide- 

 spread) and Ariz. (Apache to Mohave, s. to Cochise, Santa Cruz and Pima cos.), 

 Apr.-Sept.; from Tex., w. to Ore., Wyo. and Ariz.; also n. Mex. 



Fam. 62. Magnoliaceae Juss. Magnolia Family 



Trees, rarely shrubs or vines with bitter aromatic bark and with the leaf buds 

 covered by membranous stipules; leaves alternate, petiolate, entire, pinnately- 

 veined; flowers solitary or several clustered, usually large and fragrant, poly- 

 petalous, hypogynous, with many stamens; perianth segments (3 sepals and 6 to 

 9 petals) similarly colored, deciduous, imbricated in the bud; stamens numerous, 

 linear, caducous; anthers adnate; carpels numerous, crowded together to cover the 

 prolonged receptacle, cohering with each other and in fruit forming a fleshy or 

 rather woody conelike fruit; mature carpels opening on the back from which the 

 1 or 2 anatropous arillate seeds hang by an extensile thread. 



958 



