470 



(2) Plants with a gliincous foliage having a hnid ei)i<leriiiis: 



Agropyron repens gluucnm. litimex renosii:',. 



Ehtmits canadeiifiis (ihiitcifolius. Adoriiim leuuifolium. 



Yiivca glaiica. Argemove alha. 



Zijgiidenus renenosuH, Viohi niiHaUii. 



(3) Plants with white, often shreddy, stems: 



(Knothera pallida . Menizelia iiuda. 



(Knothera nlbicaulix. MeniziVta oligonpenna. 



Menizelia decapetala. 



(4) Plants in which the surface is reduced to a inininuim, either by a 

 sjiecial habit, as in the species of Opuntia and Cactus, or hj the leaves 

 being narrow and involute, as in the following: 



CalamorilJ'a hmgifolin. Curij Jilifulia. 



Ljigodcsmia jitvccn. Carrs xlenophi/lln. 



(5) Phuits with a deep-seated, enlarged root: 



Ipoiiiaa leptophyJla. I'suralni emulenla. 



Many of the plants belonging to the Dry i)lain tlora, and sui)posed to 

 be of more southern or western range, extend into the foothills. Among 

 these may be iiiciitioiuMl : 



Jdclinoiiia trachiinjicniKi. I'xoraleK ritujiidala. 



Axtragalns pUiilvnxis. Ador'inm tdiiiifoliinn. 



Astragalus raceuioxiii. I'eiicidanum rillosuni. 



Axliagaliix sjiatiilatim. Erigcnin catmn. 



Astragal itx gracilis. Erigvron flagellaris. 



Astragalus niicrolobiis. Crotuii tcxetisis. 



Chenopodiiiin frvmonti incainim. Sedum stenopeialnm. 



Ill many places in western Nebraska and South Dakota and eastern 

 Wyoming there are no visible streams. Tlie supertluous water is 

 dr;iiiicd olf by means of '-sand draws." A sand draw is a subterranean 

 stream. On the surface is seen only a broader or narrower band of 

 pure saml, marknig the channel. The water may sometimes be lun- 

 ning 5 meters below the surface. Sand draws are found here or there 

 among the foothills, but their place is mainly taken by the numerous 

 streams runnnig down from the hills. Many of these streams sink, 

 however, and become sand draws before they reacli ('heyenne IJiver. 

 Many plants eitiier fiom the lUack Hills ])roper or IVom tlu' .Missouri 

 Valley have spread along the watercourses. Aniong tli(»s«' wliicli ha\e 

 ascended the streams may V)e mentioned :' 



Hatninvuliis macoiniii. I'cntHivmon grandijloriin. 



Itiiripa iiaxturiium. I'mnella ntlgaris, 



(KnollKra siiiiiala. I'olygotiuin lapathifoiuim. 



'At the State UniviTsity of Nebraska tlun- is a root preserved wliicli, ia its dry 

 et.ite, is tliree-foiirths of a meter loim an«l l>..'( deciuieters in fliaint'ter. 



• Pl.iiits r.aujjiiif; across tin; coiitiiii'iit or fouiiil as well iu the Mississii)pi \'alley as 

 in tiio liockv Mountains are niostlv omitted. 



