1886.] 303 [Trelease. 



moderately firm, rounded and lobed at the apex as in T. dioicum, 

 the lower surface rugose-veiny. Panicle simple, narrow, its short 

 erect branches few-flowered. Flowers dioecious, small. Sepals 

 ovate. Stamens 10-20, on slender filaments ; anthers oblong, 

 slender-pointed. Achenia about eight, nearly sessile, 4 mm. long, 

 ovoid tapering into a straight beak ; thick-walled and otherwise 

 similar to those of T. dioicum except that they are 2-edged and 

 commonly with one less groove on each side. Stigma sagittate. 

 Seed ovoid, pointed at one end, 1X2 mm., filling the ovary. — 

 British America (Franklin Expedition), Washington Territory 

 (Vasey) W3 r oming (C. Richardson) and Colorado (Parry and 

 Vasey) Young plants were distributed with T. Fendleri in Parry's 

 Rocky Mountain Plants of 1862. 



A staminate specimen from Saskatchawan (Bourgeau) under the 

 name of T. dioicum, appears to be this species with a more com- 

 pound panicle than usual. 



10. T. occidentale, Gray, Proc. Amer. Acad, vin, 372. T. di- 

 oicum var. oxycarpum, Torr., Bot. Wilkes' Exp. 212. — Habit and 

 thin foliage of T. dioicum but the leaflets sparingly glandular-pu- 

 berulent below. Flowers dioecious. Filaments purplish, slender, 

 anthers linear, cuspidate. Achenia about ten, more or less re- 

 flexed, lanceolate or somewhat falcate, scarcely oblique, 8-10mm. 

 long, tapering below into a short stipe, and above into a long one- 

 sided curved beak ; thin-walled, slightly 2-edged, with about eight 

 parallel ribs occasionally forked or with shorter intermediate ones. 

 Stigma narrow, elongated. — Vancouver's Island to California ; east 

 to Montana. 



Referred to T. dioicum by Lecoyer,but distinct in the glandular- 

 puberulent foliage and the long and slender thin-walled 2-edged 

 achenia that are ribbed instead of furrowed. Flowers that may be 

 of this species, from Hooker, in the Berlin herbarium, have in some 

 cases blunt and pointless, in others long mucronate, anthers. 



A simpler form from Washington Territory and Montana, with 

 shorter and more flattened often glandular achenia (Fig. 10) ap- 

 pears to be T. megacarpum, Torrey, 1 the type of which, collected 

 by Fremont on the Platte, has wider fruit than any of the later, 

 specimens. With more material it may be necessary to recognize 

 this as a valid species. 



11. T. Fendleri, Engelm., Mem. Am. Acad. n. s. iv, 5. — 1-3 ft. 



iPublished by name only in Fi-emont's Kept. Expl. Exped. 1845, 87. 



