Contributions in geographical exploration . a £ % ?* ^T- i:. a: ? w J- C rt 322 The Ohio Journal of Science [Vol. XIX, No. 6. Valley. Although the oases, to be found in spots where con-ditions have permitted the recovery of the herbaceous plants,are conspicuous in the desert valley, their influence in therevegetation of the great bare areas is, from the nature of thecase, quite limited. There are three ways in which they affectrevegetation. First, by direct extension out into the bare areas. Onlytwo of the species present have sufficiently developed thepower of sending out runners to be import

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Contributions in geographical exploration . a £ % ?* ^T- i:. a: ? w J- C rt 322 The Ohio Journal of Science [Vol. XIX, No. 6. Valley. Although the oases, to be found in spots where con-ditions have permitted the recovery of the herbaceous plants,are conspicuous in the desert valley, their influence in therevegetation of the great bare areas is, from the nature of thecase, quite limited. There are three ways in which they affectrevegetation. First, by direct extension out into the bare areas. Onlytwo of the species present have sufficiently developed thepower of sending out runners to be important in this respect. ^^^^ ^^fe^c*^ |^2h| ^^H^^^^^^^^ImImRHRHM 1 WM m. ? ,\\ iifc ?v^. ^ - Photograph by Robert F. GriggsBEACH GRASvS SENDING RUNNERS INTO BARE of the current season (1916) are sterile, but the shoots that came throughThe rate of extension is about four feet per annum. in 1915 have fruited. The beach grass, {Elymtis arenarius), is especially adapted tocope with shifting sand, and in many places in the vicinity ofthe shore it

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Keywords: ., bookcentury1900, bookdecade1920, bookpublishercolum, bookyear1920