IG 



P(JLY(jiONACK.E. Xemaccntlis. 



incurved orbicular cotyleiluiiri. — A slemler annual, witli spatulate wliite-woolly 

 mostly radical leavt-s and no stipules, stems sparingly and divaricately branched, 

 and very small flowi'rs in crowded sessile subglobose clusters in the axils and along 

 the naked branches. 



1. N. Nuttallii, Benth. Stems prostrate or ascending, a half to a foot long, 

 glabrate, reddisli : leaves narrowly spatulate, an inch or two long, including the 

 petiole, densely woolly on both sides, radical with usually a few small ones in the 

 axils of the short oblong herbaceous verticillate bracts which subtentl the branches : 

 bractlets of the ilower-clusters obovate to spatulate, a line long or less, the outer 

 without llowers, the inner smaller, glabrous outside, very woolly within : flowers 

 yellowish, less than a half line long and slightly exceeding thj? bractlets, shortly 

 pedicellate, glabrous ; inner segments broadest : akeno a third of a line long. — 

 DC. Prodr. xiv. :i;i ; Gray, Proc. Am. Acad. viii. 146. ^\ Jenudaia & jUiosa, 

 Kutt. in Journ. Acad. Philad. 2 ser. i. 168. 



On the sandy heacli near San Diego, Nutlnll, Cooper, Clcvrhmd. 



5. ERIOGONUM, Mid.x. 



Plowers perfect, involucrate ; involucre campanulate, turbinate or oblong, 4-8- 

 toothedor lobed, without awns, usually numy-ilowered (rarely 1 -few-flowered); the 

 more or less exserted pedicels intermixed with scarious narrow or setaceous bracts or 

 bractlets. Perianth 6-parted or deejjly 6-cleft, colored, enclosing the akene. Sta- 

 mens 9, upon the base of the perianth. Styles 3 : stigmas capitate. Akene triangular 

 (rarely lenticular), sometimes 3-winged. Embryo straight and axile, or (in all Califor- 

 nian species) more or less excentric anil incurved ; cotyledons foliaceous, mostly 

 shorter than the radii-le. — Annuals and herbaceous or somewhat woody perennials, 

 with radical or alternate or verticillate entire leaves, without stipules; varying 

 greatly in habit of growth, but rea<lily distinguisha])le from other genera. The 99 

 species are confined exclusively (excepting two in the Southern Atlantic States and 

 two Mexican ones) to the region between the T^lississippi Pdver and the Pacific 

 Ocean. —Torr. & Gray, Pvevis. Eriog. in Proc, Am. Acad. viii. 146. Watson, Proc. 

 Am. Acad. xii. 254. 



* Invohieres nerveless, 4-8-lobed or -tootlie.l : bracts foliaceous, 2 to 5 or more, not regularly 



ternate. 



Perennials : pediniclc naked, or verticillate-bracteate in the iniddlc 

 (in nos. 2, 'i k 13), bearing a sinijile or compound umbel or 

 head or a solitary involucre : base of flower stiiie-like. 

 Involucres deejily lobed ; lolxis becoming rellexed. 



Flowers ]>ul)escent : involucres mostly solitary : low, ccsintose, 

 with leaves tomentose both sides. 

 Dwarf, densely matted : leaves ovate- to oblong-spatulate. 1. K cjespitosum. 



Larger, more ditluse : peduncles (3 or 4 inches high) with a 



° whorl of leaves in the middle. 2. L. Douglasii. 



Similar, but leaves linear-spatulate, often revolute : often 



with 2- 4-rave<l umbel, lateral rays bra.teate. 3. E. SPH^UOCEPIIALUM. 



Flowers glabrous : umbel simple or compound : ditfusely branched 

 at base • leaves glabrate above, oblanceolate or si)atulate. 

 Tomentose : umbel simple, of 3 to 10 naked rays. 4. E. umukli^atum. 



Glabrous: umbel few-rayed, the lateral rays bractcd mthe 



middle and often divided. •'''• >- loiinKVANUM. 



Tomentose : rays 2 to 4, usually and often repeatedly cymose- 

 divided ; nodes all biacteate. 



6. E. STKU.ATIIM. 



