72 PROCEEDINGS OF THE AMERICAN ACADEMY 



the Colorado near the confluence of Williams River, Dr. J. M. 

 Bigelow, 1854, and in the same district by Dr. Parry in 18G7, winter 

 vestiges only ; near St. George, Southern Utah, Dr. Parry, in blossom. 

 A showy species, well worth cultivating ; the white petals an inch and 

 a half in length. Peduncles rather short, mostly 3-flowered and with 

 pedicels not longer than the turbinate calyx-tube. Capsule half an 

 inch long, broad and short, somewhat turbinate. Seeds very numerous 

 and minute, narrrow-oblong, ribbed. 



Mentzelia (TiiACHYPHYTUM) ToRREYi. Hispidulo-scabcrrima, 

 humilis, confertim raraosisslma ; ramis demum candidis ; foliis anoaistis 

 marginibus revolutis, caulinis tri- (-5-?) fidis, lobis lanceolatis, rarae- 

 alibus integerrimis linearibus sursum sensim subulato-attenuatis ; flori- 

 bus subsessilibus ; calycis tubo cum capsula brevissime oblongo utrinque 

 truncato, limbo 5-partito, lobis lineari-subulatis petalis totidem confor- 

 mibus (albis?) spathulato-lanceolatis staminibusque circ. 25 subdimidio 

 brevioribus; filamentis omnibus filiformibus ; stylo 3-partito ; ovulis7; 

 seminibus (lineam longis) turgidis pyriformi-oblougis parum tetragonis 

 subrugosis nigris. — Sterile saline plains of Humboldt County, Nevada, 

 collected only by the late Dr. Torrey in 1865. 



Petalonyx Parryi. Frutescens ; ramis usque ad flores capitato- 

 spicatos foliosis ; foliis inferioribus oblongis spathulatisve integerrimis 

 subsessilibus, superioribus majoribus rhombeo-obovatis ovatisve crenatis 

 basi acutis brevi-petiolatis ; calycis lobis linearibus ovario bis longiori- 

 bus unguibus petalorum flavescentium paullo brevioribus. — St. George, 

 Southern Utah, Parry. Much resembles P. nitidus of Watson, of 

 Southern Nevada ; but the leaves of that are very obtuse or rounded 

 at base, the flowers smMller (in ours the petals are fully 5 lines long 

 and decidedly yellowish), and the calyx-lobes shorter than the ovary, 

 and only one-third the length of the claws of the petals. In all three 

 species, instead of " didymous," the anthers should rather be described 

 as four-celled, their two short cells deeply divided or didymous. 

 P. Parryi has a woody base; and a specimen of P. TImrberi, collected 

 by Dr. Cooper on the eastern borders of California, is saidlo be "a 

 shrub two feet high." 



Thelesperma subnudttm:. Nanum; cauh'bus e caudice multicipiti 

 perenni brevissimis foliosis ; foliis crassiusculis rigidulis 1-2-ternatipar- 

 titis, segmentis brevibus lineari-lanceolatis vel oltlanceolatis ; pedunculis 

 simplicissiiiiis scapiformibus spithamieis ; ligulis uuUis ; acheniis Itevibus 

 coronula obtuse 4:-5-dentata nuda sui^eratls. — St. George, Southern 

 Utali, Dr. Parry. Resembles T. subsimplicifolium var. scaposum, 

 which was also collected by Dr. Parry. 



