. Results of a biological survey of Mount Shasta, California. Natural history; Natural history. OCT., ROCK SLOPES. 25 ROOK SLOPES. The whole upper part of the mountain between the glaciers and snow banks above and the forest belt below consists of bare rocky slopes, broken at intervals by precipitous cliffs and small heather meadows. The slopes are largely pumice sand, strewn and mixed with fragments of gray volcanic rock, among which the individual plants are so scattered as to disappear iu the genei-al view.' White-footed mice {Peromyscus (jamheli) are common on these slopes, feeding
. Results of a biological survey of Mount Shasta, California. Natural history; Natural history. OCT., ROCK SLOPES. 25 ROOK SLOPES. The whole upper part of the mountain between the glaciers and snow banks above and the forest belt below consists of bare rocky slopes, broken at intervals by precipitous cliffs and small heather meadows. The slopes are largely pumice sand, strewn and mixed with fragments of gray volcanic rock, among which the individual plants are so scattered as to disappear iu the genei-al view.' White-footed mice {Peromyscus (jamheli) are common on these slopes, feeding on seeds of Polygonum neu-berryi and other timberline plants. Pocket gophers (Thomomys monticola) occur here and there and throw up their characteristic mounds in the pumice sand between the rocks. They subsist on the tough roots. Fig. 12.—Cbaracteristic ronk slope on north side nt' Sba^tina. of alpine plants, and were observed at intervals up to an altitude of 9,000 feet. The pika or rock cony (OcJiotona scMsticeps) inhabits steep rock slides at distant points around the peak, and lays up stores of plants for winter use. Another mammal inhabiting the rock slides 'The commonest plants of tbe bare stony pumice slopes are: Jgoseris monticola, Antennaria media, Arahis pJ(tli)spcrnui, ChwnacHs ueiadcnsis, Chrtjsotliammis hloomeri, Cymopterus teveljinihiniis, Eriogoniim polijpodum, JE. pyrohifoJiiim, Erigeron compoaitm trifidus, Sulsea Jarseni, H. nana, Lnihea. pectinaia, Lupinus ' ornaiun,' L. lyaUi, I'ent- slemon mcnzieai, PUlox douglasi diffusa, Polygonum nexduriyi, P. shastense, Saxifraga tolmiei, Senecio canua, SiUne grayi, S. sulcsdorji, Spruguea umhellala, Sfrepianthus orbicnlatus, and Viola purpurea. Besides tliesc, several ferns occur very sparingly on the rock slopes. These are Dryopteris iiculcatd scopulina, Cy^topteria fragilis, Clieilanthes graeillima, and Phegopteris aJpestris. 21763—Fo. 16- 4. Please note that these images are extracted from scanned page images th
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