40 PROCEEDINGS OF THE AMERICAN ACADEMY 



Tagetes Lemmoni. Fere glaberrima, 2-3-peclalis ; caulibus sti-ictis 

 superne subfastigiatim ramosis paiiiculato-polycepbalis ; foliis oiimibus 

 oppositis ; foliolis 5-7 lanceolato- seu elliptico-liuearibus ajqualiter ser- 



paleae breviusculae, lateralibus inferioribus brevissitnis : herba annua, humilis, 

 glabra, diffusa, loliis alternis lineari-pinnatipartitis. 



D. ANTiiEMiDiFOLiA, Bcntli. Bot. Sulph. 29. — Lower California, Hinds, Dr. 

 Streets. 



HYMENATIIERUM, Cass. 1817, 1818. Hymenatherum (cxcl. § 2), Di/sodia 

 § Aci])hi/lla:a, Gna/)lialiopsis, DC'., cum Thymophijlla, Lag. & Lowellia, Gray. 



§ 1. Acipiiyll.i;a, DC. (sub Di/sodia), Gray, PL Wright, i. 115. Palca) p;ippi 

 simplicis 18-20, angustaj, superne in setas capillares 3-5 dissoluta) : sufl'rute.x 

 foliis integerrimis aceroso-filiformibus oppositis, capitulis subsessilibus. 

 11. ACEKOSU.M, Gray, 1. c. Dtjsodla ? acerosa, DC. Aciplii/llcca acerosa, Gray, 



PI. Fcndi. 88. 



§ 2. Dysodiopsls, Gray, PI. Wright. 1. c. o.xcl. spec. Palea) pappi simplicis 10, 

 rigidae, achenio breviusculo hand longiores, lanceolataj, corolla disci brcviorcs, 

 aliffi apice subulato-acuniinataj, alia; apice fissa; trisubulata; : herba foliis 

 alternis pinnatifido-dentatis, capitulis fulioloso-calyculatis. 

 H. TAGETOiDEs, Gray, 1. c. Dysodla tagctoldcs, Torr. & Gray, Fl. ii. CGI. 



Texas. 



§ 3. EcHYMENATiiERUM. Pappi palcaj 10-20, aut omnes aut interiores 1-3- 

 aristata?, aristis corolla disci vi.x brcvioribus : capitula saepissinie pedunculata, 

 basi paruni bracteolata vel nuda. 



* Ligula; pancEE, brevissimas, inconspicua; : pappus rigidus, duplex, utroque 10- 

 paleaceo, paleis exterioris truncato-obtusis, interioris triaristatis : herba annua, 

 erecta, glabra ; capitulis brevi-pedunculatis bractcolis paucis setaceis subtonsis. 

 H. Keo-Mi:xica\um. Adenoplnjllum IVrirjhlii, Gray, PI. Wright, ii. 92. — New 



Mexico, found oidy by Wright. Certainly of this genus. 



* * Ligulse exserta), conspicuae : pappus minus rigidulus, aristis capillaribus vel 



tenui-setiformibus. 



•*- Ilerbas annuaa, glaberrima; (nunc podunculis minutissimc glanduloso-pube- 

 rulis), humilcs, dilf'iiso-ramossimte, floribunda; ; pedunculis breviusculis ; foliis 

 nioliibus pinnatipartitis in segmenta sublincari liliformia obtusa prorsus 

 niutica, superioribus alternis. 

 IL POLYcii/ETUM, Gray, PI. Wright, i. 116. Pappi palcas 18-20, angustissiniEe, 



ina*qualcs, plorumquc nniaristata; ct bi- (raro 4-) aristulatae, exteriorcs minores 



magis attcnuata; uniaristulata?. — Texas and New Mexico. 



H. DiFFUSUM, Gray, 1. c. I'appi palea; 10 brevi lanceolata;, in aristam 3-4-plo 



longiorcm inter sctulas vel denies breviter aristulatos 2 producta\ et 2-5 jjarva; 



sinjplicissima; subuliformes in serie externa imperfecta. — i\Iexico, Tate, in herb. 



Hook., only specimen yet known to me. 



II. TEXuiFOLiUM, Cass. Dict. xxii. 313. Pappi palere 10, breves, oblonga;, 



2-3-aristata?, aristis lateralibus contrail dimidio brcvioribus tcnuioribus, raro 



setulis 2 adjcctis, additx> 2-3 minima; setiformes inconspicua;. — I had con- 



