190 PROCEEDINGS OF THE AMERICAN ACADEMY 



cris minimis 4-fidis sesquifloris glabris ; bracteolis nullis ; perigonio 

 albo basi pilosulo, segmentis asqualibus cuneato-oblongis, exterioribus 

 obtusis vel retusis, interioribus apice truncato pi. m. eroso-tridentatis. 

 — California, in the Mariposa Grove, &c, Bridges, Brewer, Bolan- 

 der. Nevada, Anderson, Bloomer. Pedicels seldom more than an 

 inch long, truly capillary. Involucre only half a line, but the flower 

 a line or with age a line and a half long : usually only one is de- 

 veloped, but there is always a rudiment of a second flower. Ache- 

 nium lenticular. 



3. OXYTHECA, Nutt. p. p., Benth. in DC. 1. c. 



Involucrura pauciflorum, cyathiforrae, 4-fidum, lobis aristatenui su- 

 perlatis. Flores, bracte'ola?, etc. Eriogoni. Achenium lenticulare. 

 Radicula longa cotyledonibus orbiculatis accumbens. — Annua?, Cali- 

 fornia?, unica e Cordilleras Chili et Mendozre, divarieato-ramosissima>, 

 laxiflorre, ramis teneribus glandulis parvis pedicellatis hinc inde con- 

 spei-sis. — Genus Eriogono proximum, nunc speciebus novis confir- 

 matum. 



* Tnvolucra omnia pedicellata ; pedicellis alaribus saltern inferioribus 

 gracillimis nudis. Folia bracteasque tantum mucronatse. 



1. 0. dendroidea, Nutt. PI. Gamb. p. 169; Benth. 1. c. Effuse 

 cymoso-ramosissima ; foliis radicalibus lanceolatis seu lineari-lanceolatis 

 hirsutulis, caulinis bracteisve gradatim diminutis basi nunc subconnatis; 

 aristis involucri soepe inoequalibus. — Forma tenuior floribunda est 

 Brisegnoa Chilensis, Remy in Gay Fl. Chil. 5, p. 292, tab. 58, et 

 Tetraraphis apiculata, nunc Oxytheca apiculata, Miers. Forma vege- 

 tior magis foliata, floribus sparsis, O.foliosa, Nutt. 1. c. — This larger 

 foliose form was collected in Nevada near Empire City by Dr. Torrey, 

 and recently, in Clarence King's Expedition, by S. Watson, who also 

 gathered in abundance in the Douglas Range, Nevada, a very slender 

 and exceedingly floriferous form, quite like the South American. 

 All Nuttall's specimens we have seen are intermediate between the 

 two. The involucres vary from half a line to nearly a line in length, 

 not counting the awn, upon the length of which no dependence can 

 be placed. 



* * Involucra subsessilia vel bracteis plus minus connatis suffulta. 



