4 PROCEEDINGS OP THE AMERICAN ACADEMY 



Helianthoidece. 



SiLPHiUM ALBiFLORUJi. S. laciniato affinis, humilius (1-3-pedale); 

 foliis minoribus circumscriptioue sa?pius rotundatis, petiolo basi dilatato 

 integerrirao ; involucro discum baud superante ; ligulis albis ; acbeniis 

 puberulis apice bidentato-alatis et subulato-biaristatis, deutibus arista? 

 pi. m. exserta? adnatis. — On limestone rocks, in prairies or on low 

 bluffs, Western and Northern Texas, Reverchon. Peculiar in the 

 genus for its white rays, and distinct from the ordinary Compass-plant 

 in the akenes and other particulars. 



Wtethia longicaulis. W. amplexicaiiU perafHnis, elatior ; foliis 

 lanceolatis, caulinis omnibus basi angustatis nee amplexicaulibus ; capi- 

 tulis plerumque longe pedunculatis ; involucri bracteis exterioribus 

 majoribus foliosis ; pappo brevi coroniformi multi-crenulato vel eroso. 

 — Prairies of E. Humboldt Co., California, V. Rattan, incomplete 

 specimens in 1876, good ones in 1883. 



Gymnolomia encelioides. Annua, strigoso-incana ; caule ramose 

 hispidulo ; foliis longiuscule petiolatis ovato-oblongis obtusis subinteger- 

 rimis, superioribus alternis ; involucro (lin. 5 alto) biseriali, bracteis 

 exterioribus oblongo-lanceolatis acutis cano-pubescentibus nunc hispi- 

 dulis asqualibus interiores sublineares minores paullo superantibus ; 

 receptaculo et disco parum convexis ; ligulis 10-12 ovalibus vix polli- 

 caribus aureis ; corollis disci apice atro-purpureis ; bracteis receptaculi 

 apice trifidis ; acheniis obovato-oblongis inferne parce versus apicem 

 crebre villosis ; pappo aut nullo aut squamellis setiformibus minimis 

 inter pilos achenii summos. — Mohave Desert, near Agua Caliente, 

 S. E. California, S. B. Sf W. F. Parish, April, 1882, This has the 

 habit of an Encelia ; but the nearly full-grown akenes are not flat 

 nor acute-edged. 



Gymnolomia ovata. Caule strict© herbaceo 2-3-pedali ; foliis 

 ovatis brevissime petiolatis serrulatis (sesquipollicaribus) venosis tri- 



sniall-leaved form of G. oxyphyllnm ; and the brandies of Parry & Palmer's 417, 

 as also a part of Coulter's 451, answer to the character. Lanate forms of the 

 species seem to pass into G. brachi/plerum, DC, the originals of wliich are 

 Berlandier's 7C0 and 2189. Ghiesbreght's IGl, Linden's 1191, and a plant of 

 Schaffner's collection, sent by Schultz as G. oxi/phi/llum, are the same. 



G. ATTENUATUM, DC. To tliis may be referred Liebmann's 309, from Colepa, 

 and a quite similar plant from Orizaba by Schaffner ; both have been named 

 G. Derlandieri, DC. (of which I have no specimen), but they do not agree with 

 the character of that species, as they do with tliat of G. attenuatum ; and they 

 differ from G. oxyphjUnm in the particulars which DoCandolle mentions. 

 Schultz's determination must have been a mistaken one. 



