APPEIsDIX. 
477 
^ * * Involucre none. 
6. LASTAKRIiEA, Remy. Perigonium subcoriaceons and resembling tho involucre of C/iomrt/fi/ie; 
stamens inserted at the throat.— A single Chilian species, L. Chilfa'SIS, Remy, introduced into Cali- 
fornia. 
Tribe II. PTEROSTEGIEJ^. Involucre of a single 2-lobed bract embracing the Holitary liower, be- 
coming dilated aiid reticnlatcd in fruit and 2-gibbous-saccate on the back. 
7. PTEROSTEGIA, E. & M. Tu'o species of Soiitliern a?id Lower Califoruia, annuals, Avith o})posite 
more or less lobed and somctiiues toothed leaves ;— P. ])I;v.m.u;i(>!!)Ks, E. & M., with the iViiiting involu- 
cre 1-1^" long, dentate on the margin ; and P. maci.'oi'Tkha, Bcnlli., with tlie involucre y long, sinuate- 
margined. 
ERIOGONUM. 
§, 1. ALATA, Benth. Achenium .'5-\vingcd ; enil)ryo in the axis, straight or ncn ly so ; calyx (i-j-ai I. «1, 
not produced at base. Perennials or biennials, the scipclike stems ' high ; involucres mostly 
long-peduncled, loosely cymose-panicled ; leaves r.i.lical, spatulate or lanceolate; piibesccnco loose. 
1. E. hiei:.vcifoltu:\i, Benth. Cinereous-pubescent, the leaves subtotneutoso aii<l sumcwhal silky- 
villous ; tlowers more or less pubescent, with the filaments and ovary siil»hirsMte, yellow, (or vnsf-,;Ai>r :) 
panicle nuuiy-llowcied ; aclicniiun winged only above the middle.— W. Tcx.is. 
2. E. ALATUM, T(n-r. Tall, more or less hirsute-villons ; ])aniclc dcc()n)])()Mi)(l : llu\\< rs <;iahroiis, 
small, ytdlowish; invoulcres numerous, 5-toothed ; aclieiiiimi wingnl ncaily to Hh' base, wiii-s ratlicr 
broad, thin.— From the Platte to W. Texas ami New Mi'xiro. 
■3. E. ATiuHa oKXS Eng. Leaves vilh)us-])n)ii sia'iit : scape more oi- less iuliated, dielmiomously <li- 
vided into a loose cyme : involucres few, lon;.;-)u'iluncled, .VT-tootlied ; llow<'rs glabrous, reiUlisli ; wings 
as hmg ;is the aclieuium, narrow aiul thickened.— Chihuahua. 
2. ERIAXTHA, Benth. Achenium wingless, (as in idl the renuiining sections;) einluyo straight, 
axile, the radicle shorter th:m the broad cotyledons ; (lowers villous or silky, wilh a narrow elon- 
gated base. Per(>nnials, with branching leafy stems, .alternate or verlieillaie leaves, loni.-nios.! 
beneath, and solitary jnostly sessile involucres. 
* Leaves alternate, narrow; panicle open, naked; calyx herliaeeous, ilie lobes alilvc. 
4. E. i.oXGiKOLTrir, Xutt. Tall, 2-4° high ; lower involucres more or less )ic.bin( led.— Florida, Ar- 
kansas and Texas. 
* * Leaves in whorls of 3-5, oval or oblong; cyme dichotomous, leafy; involucres sessile, many- 
flowered ; calyx white and somewhat corolla-like, inner lobes often the longer. 
5. E. TOMENTOSUM, Mx. Tall, herViaccous, Very leafy J leaves obovate or o\ .iK il.ir. Jomentum col- 
ored;' calyx tomentose, the tube elongated, lobes broadly ovate.— Sontli C.arolin.a to Elorida. 
6. E.TxDULATUM, Benth. Low and woody : leaves undulate; Jlowers smaller.— ib-xico. 
7. E. jAMESii, Benth. Low, woody at base; caulim" leaves few, spatulate or oblong, lomentnm 
white; calyx villous-silky, with obovate or spatulate lobes.-Krom the I'latfe lo W. T<xas and New 
Mexico. 
§ 3 UMBELLATA, Benth. Flowers as in 2: involucres many-tlowered, soliiary or rarely caj.iiate, 
or in simple or compomid terminal und.els : ova)y usually sparingly hirsute above ; . niluyo nearly 
straight, equaling or exceeding the more or h ss .-eeentrie eotyldous.-l'en nnials. laos.ly low, 
sometimes woody ; leaves usually white-woolly and mostly snatulat-: l!o-.. r> nearly always 
yellow. • T- •• ^ 
* Calyx villous or pn^ : rn::i!v. i,-xr, ;,t in /,. hUlooit.) 
(a.) Involucre campamilate, repand-demah- -^-^ . : un.bd usually many-rayed with an in- 
volucre of as many (2-8) ;ibout e-iual leaves ; .■u.biyo si lai-ht. 
8 E i r wr.M Xult. sili.v-wm.llv ; seain s :Mi' high ; lea ves spatulate or lance-oblmig oi 
crowded'; calyx yellow, silky-v.Uous, :i ' long.-Frun. the Saskatchewan to W. Kansas and • : 
Oregon. 
(&.) Involucre lobed, snlitarv, naked, or somerinies 2-:! rogdlier in an m.,. ' 
head; embrvo eccentric, olbn i!-,ne,,1. T!.e firs* ^...i.s with snudlh-a 
lucre with tjroad scareel.N 
involucre with narrow ann 
Ti I Ti- 1 , -.t ,-i)tose. 1 ii" nunieroii .'-aly 
9. E. TiivMoiDKs. Eeuth. W <H>dy. < a-p.-r.. ' >r( , 
,. , , > ! ' ,.,.dunel.- with awhoi, • ' ...kUc, 
at base, a .siniii high ; leaves 2-:i iong. m.-ir-in - i"""" 
calyx densJiy retnuse-villous at l.ase.-AVashingron Territory. 
