60 NORTH AMERICAN FAUNA. No. 16. 
PLANTS OF TRANSITION ZONE—continuéd. 
(2) Species restricted to Transition zoné. 
Abies concolor lowiana. Hieracium albiflorum (large form). 
Acer circinatum. Hieracium cynoglossoides nudicaule. 
Acer glabrum.* Hieracium greenci. 
Acer macrophyllum. Horkelia pseudocapitata, 
Achillea lanulosa. Lappula nervosa. 
Alnus tenuifolia. Libocedrus decurrens, 
Amelanchier alnifolia.* Lilium washingtonianum. 
Anaphalis margaritacea. Linnea borealis.*! 
Antennaria geyeri. Linum lewisi. 
Apocynum pumilum. Lotus americanus. 
Aquilegia truncata. Lupinus minimus. 
Arctostaphylos patula. Osmorrhiza nuda. 
Artemisia ludoviciana (form). Pachystima myrsinites.* 
Asarum hartwegi. Pronia browni. 
Ceanothus cordulatus. Pinus attenuata. 
Ceanothus integerrimus. Pinus lawbertiana. 
Ceanothus (Cerastes) prostratus. Pinus ponderosa. 
Ceanothus velutinus. Polygala cornuta. 
Cerasus demixsa. Psendotsuga mucronata, 
Cerasus emarginata. Querens californica. 
Cerasus glandulosa. Rhamuus californica (or rubra). 
Cercocarpus ledifolius. Ribes klamathense. 
Chrysamphora californica. Ribes viscosissimum. 
Chrysothamnus bloomeri angustatus. Rosa californica. 
Cornus nuttalli. Rosa gymnocarpa. 
Cornus pubescens. Rubus parviflorus.* 
Corylus rostrata californica. Rubus vitifolius. 
Crate gus rivularis.* Salix lasiandra. 
Cryptanthe geminata. Sambucus melanocarpa, 
Fragaria bracteata. Sisyrinchium bellum. 
Fragaria chiloensis. Smilax californica. 
Fritillaria atropurpurea. Solidago elongata. 
Gayophytum ramosissimum. Symphoricarpos pilosus. 
Gilia (Collomia) grandiflora. Symphoricarpos-racemosus. 
Hastingsia alba. 
In other mountains the species marked with an asterisk (*) are believed to occur 
in the Canadian zone as well as the Transition. 
(3) Species common to Transition and Upper Sonoran zones. 
Alnus rhombifolia. Fraxinus oregana. 
Artemisia tridentata. Juniperus occidentalis. 
Betula occidentalis. Kunzia tridentata. 
Cercocarpus parvifolius. ? Populus trichocarpa. 
Chrysothamnus occidentalis. Prunus subcordata. 
Eriogonum nudum. Rhus trilobata. 
!1Linnaa borealis is ordinarily a Boreal plant, but it was not found in the Boreal 
belt of Shasta, though common in places at Sisson. The Sisson form has been 
separated as var. longisiorw, and may be worthy of recognition as a Transition zone 
eubspecies. 
