8 MIMULUS LUTEUS AND SOME OF ITS ALLIES. 



leaves. Sitka, 11/iirhn/ ; also Oregon, 'J'ohiiii', XiiWill, and others. 

 This and the preceding variety have the habit of true South 

 American ^[. Inteus ; there being no raceme, but only a few 

 peduncles axillary to the proper foliage, and the stems are short. 

 But the corolla has the ample throat and bilabiate limb which 

 most clearly marks alike all these North American kindred of that 

 species. 



Var. TiLiNGi. j\[. Tilinql Eegel, Gartenfl. xviii. 321, t. 031 

 (18G9), and xix. 290, t. 6G5 ; not of Greene, Bull. Calif. Acad. i. 110. 

 Far more slender and less fleshy than the type; also very sparingly 

 leafy, the internodes very long; leaves small, obtuse, more evenly 

 and less deeply toothed, the lower with long petioles, the upper 

 subsessile; raceme not dense. Plant of the widest distribution, 

 occurring from the Sierra Nevada and the Cascades eastwards to 

 the Kocky Mountains, and southward to the Mexican border, though 

 only in the mountainous parts of this vast area, and in moist places. 

 The plant which Asa Gray, and after him myself, mistook for this 

 is a very different one, namely, 



M. implexus. M. Tllingi Greene, Bull. Calif. Acad. I. c. (1885), 

 not of Kegel. A low, leafy, few-flowered species which I accurately 

 and quite fully described ten years since, but under a wrong name, 

 as explained above. It usually grows in dense masses among rocks 

 along streamlets, but only in the higher Sierra Nevada of California. 

 It is a most distinct species by its mode of growth. The simple, 

 erect, few-leaved and few-flowered stems arise from an interlaced 

 mass of slender amber-coloured and translucent subterranean root- 

 stocks. No other member of the group makes any approach 

 to it, either in this character or in that of the exceedingly 

 thin membranaceous texture of the leaves. It is but poorly repre- 

 sented in the herbaria, at least as to any showing of its best 

 character, because collectors for the most part take no pains to 

 get the root, but send out a mere stem with leaves and flowers ; 

 in which condition it might pass for the variety argutns of the 

 preceding species. 



M. csespitosus. M. Scoulerl var. ccespitosus Greene, Pitt. ii. 22 

 (1889). This, like the preceding, inhabits wet rocks along the 

 margins and in the midst of mountain streamlets, and is a northern 

 analogue of M. iwplexus, being confined to the high peaks of 

 Washington, or perhaps extending into Northern Oregon. It is 

 low and malted, but without subterranean rootsLocks ; the simple 

 mostly 1 -flowered upright stems being half-buried in a mass of 

 filiform or almost capillary leafy stolons. It has no special con- 

 nection with the rare M. Scoulcri ; and tlie plant which I wrote of 

 as being that species, in the place quoted, is doubtless another 

 variety of M. Lmiysdorjfii. 



