264 CALIFORNIA ACADEMY OF SCIENCES. 



growth, no part of the plant, probably, living more than a 

 year, and then only in favorable places, such as living 

 springs or swampy places. All those growing in the fields, 

 on rocks or the banks of soon-drying streams, embracing 

 nine-tenths of all the individuals, are strictly annual, seed- 

 ing themselves and dying early. 



In the matter of rooting at the joints — probably all the 

 forms do so under certain circumstances, the annual ones 

 very slightly, if at all, for obvious reasons; and the rank- 

 growing, upright ones, of course, only from those joints in 

 contact with the ground. Besides this, wherever even the 

 prostrate branches are kept, by a layer of leaves or twigs, 

 or by other plants, from close contact with mud or Avater, 

 no roots spring from them. 



About the coast and the foothills of the Sierra Nevada 

 Mimulus luteus is usually glabrous in all its forms, or occa- 

 sionally somewhat pilose. It is often glaucous, pubescent 

 and somewhat viscid at moderate elevations; more glabrous 

 again in the higher ( I am speaking of the middle Sierra 

 Nevada, along the line of the Central Pacific Railroad, and 

 the time being late in September, only of the perennial 

 forms growing in wet places); and passing the summit, 

 again pubescent as the altitude decreases. About Eeno, 

 the eastward limit of these field studies, both glabrous and 

 pubescent forms grow together in the irrigating ditches; 

 and notwithstanding previous observation of clammy-pu- 

 bescent and viscid forms, it was with much astonishment 

 that in one locality the plants were found to be almost as 

 slimy as M. moschatus, the secretion, however, confined 

 principally to the peduncles and calyxes. This same form 

 showed iu many of its flowers a strap-shaped, sterile fila- 

 ment, adnate to the posterior wall for half or two-thirds of 

 its length ,^the free portion projecting from the throat of 

 the corolla, and of the same color. Occasionally a perfect 

 fifth stamen occurred. 



