FLORA OF HUMBOLDT, TRINITY AND SHASTA. 187 



Delphinium irolliifoUum, Gray. Abundant in tlie pas- 

 tures along Mad River and locally known to the stockmen 

 under the name of "poison -weed." Tlie young shoots in 

 early spring are frequently responsible for the serious illness 

 or even death of cattle. 



Si I ene Hooken',^ nit. Found abundantly on the western 

 slope of Pilot Ridge and also observed in Trinity County; 

 the petals in all cases of a pure white color and not pale 

 pink as stated in the "Botany of California." 



Ccduoilnis velidinus, Dougl. A few specimens were ob- 

 served growing in shaded canons near Kneeland's Prairie. 

 Abandoning its usual habit it here assumes an arborescent 

 form sometimes attaining a height of twenty feet and form- 

 ing trunks five inches in diameter. 



Astragalus Ratiani, Gray. A pure-white flowered form 

 was abundant as well as the normal blue in upland pastures 

 along the Mad River. 



Thermopsis moniana, Nutt. This plant does not appear 

 to have been reported from the State. The present spec- 

 imens agree in all essential particulars with one from 

 Arizona in the herbarium of the University of California. 



Trifolium scorpioides, sp. nov. Stems very numerous, 

 twelve to sixteen inches in length, stout, erect, from a thick 

 perennial root; somewhat woolly or silky-villous through- 

 out; stipules bi'oad, foliaceous, acuminate-tipped; leaflets 

 lanceolate, blunt at apex, serrulate, one to one and one half 

 inches long; spikes on long peduncles, the floriferous part 

 abruptly reflexed, while the flowers themselves are often re- 

 flexed and thus appear erect; calyx with filiform ciliated teeth 

 scarcely equalling the corolla; corolla tawny yellow to white. 



A somewhat remarkable addition to our already long list of 

 Trifolia, bat readily distinguished from them all by its pecu- 

 liar floral habit. It is most nearly allied to the T. plnmosum 

 of Douglas but difl'ers from that in the abundant pubes- 

 cence, the much smaller leaflets, shorter and more slender 

 peduncles and petioles, and the pronounced ciliation of the 

 calyx; these cilia are produced almost at right angles to the 



