130 Muhlenbergia, Volume 5 



thick (about 1 cm.), each achene sessile, obliquely somewhat 

 rhombic-ovoid, compressed, the sides without ribs or even ele- 

 vated veins, almost perfectly smooth, not turgid, faintly glau- 

 cescent, 



The only specimens seen are from that large and isolated 

 depression amid the mountains of the interior of Mendocino 

 countv that is known as Round Valley. They were gathered 

 in the month of May, 1898, by Mr. V. K, Chesnut, and are pre- 

 served in the U. S. Herbarium on sheets 430474 and 430475. 

 As unquestionably a member of the T. ametrum alliance it is 

 distinguished from the type species and the rest by its smooth, 

 almost veinless carpels. In view of this strong character I had 

 wished to name it T. leiocarpum ; but there is such a name, or 

 at least synonym, already published. 



Thalietruiii magaruni sp. now 



Also allied to T. ametrum, as tall, more slender, the stem 

 finely yet rather strongly striate, the whole plant very distinctly 

 glaucescent, blackening in drying: cauline leaves all sessile, 

 their leaflets in general cuneate-obovate, deeply as well as acutely 

 and doubly lobed: head of fruit depressed-globose or somewhat 

 so, the achenes being few and substipitate and those uppermost 

 and central diverging from the center instead of standing erect; 

 outline of achene subfalcate-ovate, its sides only few veined and 

 faintly so, the veins tortuous merely, hardly sinuous, seldom or 

 never running together to form meshes. 



Inhabitant of mountains well towards the interior of San 

 Diego county, California, collected in April, 1894, D V R- D. Al- 

 derson; the special locality a place called Witch Creek. The 

 type specimens are in my own herbarium, and I have seen no 

 others. 



Thalictruiu Latiu&culum sp. now 



Tall and very robust, glabrous throughout, the striate* 

 angled stout stem glaucous, as also the fruit, the foliage much 

 less so: leaflets dark bluish-green above, pale and glaucescent 

 beneath, large, the terminals rather deeply 3-lobed, the laterals 



; similar, sometimes but lightly 2-3-lobed, or even almost 



