530 PROCEEDINGS OF THE AMERICAN ACADEMY 



Creek, California, Dr. J. M. Bigelow. — Pubescence more like that 

 of H. congesta, but softer, shorter, and less shaggy. Flowers small ; 

 petals 3 lines long, narrow, not unguiculate. 



§ 2. Ambigua; (an Ivesia ?) ; filamentis subulatis. 



7. HoRKELiA TRiDEXTATA, Torr. Bot. "\Yhipp. 1. c, t. 6. California, 

 Dr. J. M. Bigelow. 



IVESIA, Torr. & Gray, pro parte. 



Calyx campanulatus vel basi cyathiformis, 10-fidus. Stamina deifinita 

 (5, 10, 15, 20) : filaraenta gracilia (tenuiter subulata vel filiformia). 

 Carpella pauca, quandoque solitaria, in receptaculo parvo villoso : stylus 

 subterminalis. — Pinnatifolice, millefoliolatje, foliolis parvis palmati- seu 

 pcdatipartitis creberrimis nunc quasi-verticillatis vel rhachin undique 

 iinbricantibus, petalis late obovatis vix unguiculatis post anthesin 

 spathulatis. 



* Flaviflorae, 5 -10-andr£B, glabellse ; foliis plerisque radicalibus; scapo 

 apice congestifloro. 



1. Ivesia Gordoxi, Torr. & Gray in Newberry, Rep. Pacif. R. R. 

 Exped. 6, p. 72. (Horkelia Gordoni, Hook. Kew Jour. Bot. 5. p. 341, 

 t. 12. H. millefuliata, Torr. in Sitgreaves Zuni Exped.) Spithamaea 

 e caudice crasso, viscido-pubens vel glabrata ; foliolis confertis 5-9- 

 partitis, segraentis obovato-spathulatis obtusis; cyma capitata pluriflora; 

 calycis mox turbinati lobis ovatis demum triangularibus quam accessorii 

 oblongi demum sublineares longioribus ; staminibus 5 ; receptaculo 

 loiige villoso ; carpellis 10 - 14. — Besides the New Mexican habitats, 

 we have what appears to be a dwarfer and alpine form (from which 

 the above character is mainly drawn) of the same species, collected by 

 Professor Brewer in the Sierra Nevada, at Ebbett's and Sonora Pass, 

 near Soda Springs, &c., at the altitude of 8,700 to 10,800 feet ; in 

 flower and with young fruit. The fruiting specimens are very well 

 represented by Hooker's figure. The golden-yellow petals, at first 

 almost orbicular, become spatulatc or even oblanceolate after anthesis, 

 and then shorter than the accrescent calyx-lobes, as delineated and de- 

 scribed by Hooker. Stamens only 5, alternate with the petals. 



2. Ivesia lycopodioides, sp. nov. Nana (sesqui-tripollicaris), 

 fere glabra ; foliis in caudice crasso caespitoso-confei'tis, pinnis quasi 

 vcrticillatis creberrimis, foliolis minimis 5 - 7-scctis, segmentis obovato- 

 rotundis cra>siusculi3 rhachin undique imbricantibus ; scapo capitate- 



