122 PROCEEDINGS OF THE AMERICAN ACADEMY 



Crossosoma Bigelovii. a low shrub, more slender tlian C. 

 Cah'foi-nicum, and all the parts much smaller : leaves glaucous, three 

 to six lines long, oblong, somewhat fascicled : pedicels slender, terminat- 

 ing very short branchlets : petals oblong, three lines long: stamens 

 about fifteen: carpels 10— 12-ovuled. — C. CaJifunn'cum, Torrey in 

 Paoif. R. Rep. iv. 63, t. 1, excl. fig. 1, 2. Collected by Dr. Bigelow, 

 on Lieut. Whipple's Expedition, in canons near the mouth of Bill 

 Williams River, W. Arizona ; in flower only. The petals are nar- 

 rower and the stamens and ovules much less numerous than in the 

 island species. Of tlie latter, fine fruiting specimens were for the first 

 time obtained by Dr. Palmer on Guadalupe Island ; but the charac- 

 ters of the embryo, which is found to be nearly as long as the thick 

 fleshy albumen and strongly curved, with narrowly oblong cotyledons 

 longer than the radicle, do not confirm the reference of the genus 

 either to the PcBoniece or to the DUleniacece. 



EsCHSCHOLTziA MiNUTiFLORA. Slender, and about a foot high : 

 flowers very small (three lines or less in diameter), orange; torus 

 cylindrical, without border : capsule very narrow, an inch and a half 

 long : seeds nearly smooth, scarcely half a line broad. — E. Califor- 

 nica, var. tenuifolia, Gray in Bot. Ives's Rep. 5, in part. E. Califor- 

 nica, var. hypecoides, Watson, Bot. King's Rep. 14. From North- 

 western Nevada to Arizona and Southern Utah (Parry), apparently 

 confined to the inner basin. It has smaller and smoother seeds, smaller 

 flowers, and narrower capsules than any other form. 



Arabis Lyallii. Perennial and alpine or subalpine, glabrous 

 and bright green or glaucous, or somewhat villous below with s{)read- 

 ing hairs, especially on the margins of the petioles ; rarely more or 

 less canescent with stellate haii's : stems slender, from a branching base, 

 two to fifteen inches high, often dwarf: radical leaves oblanceolate, on 

 slender petioles, acute, entire ; the cauline oblong-lanceolate, clasping 

 and sagittate at base : petals light pink, about three lines long, twice 

 longer than the sepals : style none : pods straight, narrow, erect or 

 ascending, one to three inches long : seeds in two rows, narrowly 

 winged. — A. Erummondii, var. nipina, AVatson, Bot. King's Rep. 18. 

 In the mountains from Washington Territory to Mono Pass in the 

 Sierra Nevada, and eastward to W. W^^oming and Utah. Resem- 

 bling some forms of A. Enimtnondii, but distinguished by its peren- 

 nial root. 



Auahis rkfanda. Biennial, pubescent with loose branched hairs, 

 especially below : stem rather stout and ccnirse, two feet high, the 

 Bpreadiug branches somewhat flexuous : leaves oblanceolate, three or 



