340 PHANEROGAMOUS PLANTS. 



Lessingia virgata, Gray in Benth. PL Hartw. p. 315, & in Pacif. Rail Road Rep. 

 6, p. 76. 



» 

 Hab. Upper part of the Sacramento River, California ; also detected 



in the same region by Dr. Newberry. — Stems one or two feet high, 

 from an annual or biennial root, virgate and slender, leafy, above once 

 or twice divided into virgate flowering branches, bearing a head in 

 the axil of all the upper leaves, so forming narrow virgate spikes. 

 Radical and lowest cauline leaves spatulate, an inch or more in length, 

 tapering into a short petiole. Cauline leaves shorter and half-clasping; 

 those of the summit and of the flowering branches only three or four 

 lines long, erect, bract-like, concave or cymbseform, rather shorter 

 than the heads. Involucre cylindrical, three lines long, shorter than 

 the disk ; the scales pluriserial, linear, obtuse and muticous, appressed, 

 when young woolly outside, at length glabrate. Flowers from 5 to 7 

 or sometimes 8, all alike, except that the outer ones have a slightly 

 larger, but regularly five-cleft (probably white) corolla, and a more 

 scanty pappus : in all the flowers the pappus barely equals the slender 

 tube of the corolla. The appendage of the styles, which is only 

 rudimentary in L. ramulosa, is here prolonged and subulate, and beset 

 with the bristles, which in its congeners form the penicillate tuft, the 

 larger part of them near its base. 



5. MACH^ERANTHERA, Nees. 



1. Mach^ranthera canescens, Orai/, var. incana. 



Diplopappus incanus, Lindl. Bot. Reg. 1693 ; Hook. Bot. Mag. t. 3382 ; DC. Prodr. 



5, p. 278. 

 Dieteria incana, Torr. & Gray, Fl. K Amer. 2, p. 100. 



Hab. Oregon ; the locality not recorded. — A single specimen, man- 

 ifestly Lindley's Diplopappus incanus, but only a large-flowered, 

 narrow-leaved, and hoary form of Aster canescens, Pursh {Machceranthera 

 canescens, Gray, PL, Wright, &c), of which all Nuttall's species of 

 Dieteria are forms, except his D. coronopifolia ; and that is the original 

 Macliairanthera tanacetifolia. 



