VEGETATION OF MT. ST. HELENA. Ill 



17. Razoumofskya 0CCIDENTALI8 O. Ktze. Parasitic on Pmws 

 attenuata Leinmon, 



18. LONICERA INTERRUPTA Benth. 



19. BiGELOViA ARBORESCENS Gray. Ouly one or two plants 

 noticed. The most northerly station recorded. 



20. Helianthella Californica Gray. 



21. Senecio aronicoides DC. 



22. Campanula augustiflora Eastwood. 



23. Arctostaphylos manzanita Parry. 



24. Arctostaphylos Stanfordiana Parry. Unlike A. man- 

 zanita (which ranges altitudinally from valley-levels to the highest 

 Coast-Range ridges), this species is only found at considerjible eleva- 

 tions in the mountains, on plateaus, or on more or less flat summits 

 or broad slopes. The mountaineer recognizes each of these shrubs, 

 without hesitation : the foliage of A. manzanita is of a grayish or 

 dull green ; the foliage of A. Stanfordiana is of a vivid green. 

 The former shrub (which in this region is often 12 or 14 feet high) 

 often looks ragged or unkempt ; the latter is exceedingly trim and 

 neat, and one rarely finds an imperfect or insect-eaten leaf Its 

 height is commonly about 3^ or 4 feet. 



The botanical traveler, however, is at once interested in a striking 

 unlikeness between the two shrubs, an uulikeness^ which does not 

 originate from a mere difference in' the hue of the foliage, but is of 

 a sort more tangible and, in this case, more impressive. While the 

 leaves of A. manzanita are said to be vertical, many leaves on 

 a shrub are not vertical, and as many as one-half the leaves on a 

 twig may not stand in a vertical position, but very nearly all the 

 leaves on a shrub of A. Stanfordiana are quite vertical. This is a 

 feature of the shrub, which appeals to the eye, and is quite well 

 shown in the plate (PI. Ill) which accompanies this article. 



' These differences in habit have not, hitherto, been described, and 

 to these vegetative differences may now be added certain differences 

 in the flowers of the two species. The flowers of A. manzanita 

 are commonly white, about four lines long, with the calyx quite as 

 broad as the base of the urn-shaped corolla. The flowers of A. 



