156 PROCEEDINGS OP THE AMERICAN ACADEMY 



cotyledonibus pi. m. excentricis longiore vel sequilonga. — Herbre 

 perennes, nunc'suffrutescentes, srepissime humiles, foliis plerum- 

 que subtus prtesertira albo-lanatis, raro glabratre vel glabra ; flori- 

 bus fere semper flavis vel luteolis nuuc purpureo tinctis. 



* Perigonium extus villosum seu pubescens. 



h— Involucra repando-5 - 7-dentata, campamrlata. Umbella srcpius 

 pluriradiata, foliis involucrantibus subtensa. Embryo rectus, pa- 

 rum «*xcentrieus. 



8. E. flavum, Nutt. in Fraser, Cat. Pube sericeo-lanata canescens 

 vel incanum ; pedunculis scapiformibus (3 - 6-pollicaribus) e caudice 

 crasso multicipiti ; foliis spatbulatis seu lanceolato-oblongis supra tar- 

 dius glabratis, radicalibus in caudice confertis, involucrantibus 2 — 8 

 radios totidem subrequantibus ; perigoniis aureis extus sericeo-villosis 

 basi infundibuliformi substipitatim producta; ovario apice hirsuto. E. 

 sericeum, Pursh. — Variat : 1. Foliis crassioribus lana subtus densiore. 

 E. crassifolium, Bentb. Eriog. ; Hook. Fl. Bor.-Am. t. 176; tbe in- 

 volucre represented too deeply tootbed. 2. Foliis subovatis crassis su- 

 pra glabratis subtus lana ferruginea. Crater Pass, Newberry. 3. Na- 

 num ; umbella in capitulum ex involucris 3-4 sessilibus nunc ad 

 involucrum solitarium reducta. E. aureum, Nutt. in herb. 4. Vege- 

 tius, subpedale, umbella bis 3 - 4-radiata, radiis valde inrequalibus. — 

 "W. Kansas to Saskatchawan, Rocky Mountains, &c. Flowers three lines 

 long. The embryo is straight, but with the cotyledons moderately ex- 

 centric ; these are nearly as broad as the albumen (as in all Umbellata), 

 and shorter than the radicle, which is not perceptibly inflexed at the 

 junction. 



-l— -i— Involucra lobata, srepius in pedunculo solitaria, nuda, nunc 2 — 3 

 in umbellam imperfectam 2 - 3-radiatam vel capitulum collecta. 

 Embryo ubi observatus incurvo-excentricus. 



++ Microphyllum : involucrum turbinatum, sublobatum, lobis den- 

 tibusve latis vix patentibus. 



9. E. thymoides, Benth. in DC. Suffruticosum, ca^spitoso-ramosis- 

 simum (spithama3um), cinereo-tomentosum ; ramis floridis inferne folio- 

 sissimis ; pedunculo infra medium verticillo foliorum instructo ; fo- 

 liis (lin. 2-3 longis) lineari- seu oblongo-spathulatis margine revolutis ; 

 perigonio basi cyathiformi attenuata pilis creberrimis reflexis villosissi- 

 mo. — N. branch of the Columbia, Wilkes's Ex. Expedition. Simcoe 

 Hills in the same region, Dr. Lyall. A most distinct species: the 

 flowers apparently pale yellow with some tinge of purple. 



