1907] Hall. Compositae of Southern California. 67 



silky-villous. Pappus commonly of numerous unequal scabrous 

 bristles, usually turning reddish-brown. 



Lessingia finds its nearest relative in Corethrogyne, which it 

 closely resembles in habit and technical characters of the invo- 

 lucre, anther-tips, and style-appendages. And this is true, not- 

 withstanding the fact that Corethrogyne belongs to the Hetero- 

 chromeae while Lessingia is classed with the Homochromeae ; for 

 in the recently discovered L. heterochroma we have a Lessingia 

 in which the color of the ray-corollas is strikingly different from 

 that of the disk-flowers, thus tending to break down the distinc- 

 tion between these subtribes. 



Outer corollas enlarged and irregularly cleft. 



Stems branching from the base: outer flowers pink 



1. L. heterochroma. 



Stems erect, branching only above the base: flowers all yellow 



2. L. glandulifera. 



Corollas all regular (or nearly so) and alike, yellow: var. tennis of 



3. L. ramulosa. 



(See also extra-iimital species, p. 69.) 



1. L. heterochroma Hall, sp. nov. 



Koot annual : stem much branched from the base, the branches 

 decumbent and .5 to 2 dm. long: herbage white with a dense 

 tomentum deciduous at time of flowering only from the branch- 

 lets, which are then minutely but densely glandular; no tack- 

 shaped glands on leaves or involucre: basal leaves numerous, 

 mostly entire, rarely with an obscure lobe, spatulate, obtuse, 1 to 

 2 cm. long; rameal leaves scattered, entire, spatulate-oblong to 

 linear, obtuse, .5 to 1.5 cm. long: involucre hemispheric, 5 mm. 

 high, 18 to 22-flowered; outer bracts white with persistent wool, 

 loose, mostly obtuse; inner bracts purple, granular, erect or ap- 

 pressed, imbricated, acute : flowers of two sorts, the 2 or 3 outer 

 series with pink corollas more deeply cleft on the inner side, thus 

 forming an irregularly 5-lobed ligule; inner corollas yellow, 

 regular: style-branches obtuse, short-bristly, the apical prolonga- 

 tion minute or obscure : achenes compressed, canescent with long 

 hairs: pappus-bristles about 20, slightly longer than the disk- 

 corollas, dull white to fuscous. 



Dry soil of the Upper Sonoran Zone, Lockwood Valley, Mt. 

 Pinos, Ventura Co., California, Jim. 28, 1905, Hall, no. 6440 



