110 



PLANT^ WRIGHTIAN^ 



V. 



cilibus; achcniis extimis lineari-oblongis teretiusculis intus verrucoso-tuberculatis 

 breviter biaristatis, interioribus lineari-subulatis laevibus sensim longioribus et lon- 

 gius aristatis, centrali persistcnte majore ; aristis subulatis persistentibus Iscvissimis 

 divergentibus vel recurvis. — Plains between the Guadalupe Mountains and the Pe- 

 cos ; Oct. — The specimens are wholly in fruit, the involucres, paleae, &c. fallen, and 

 for the most part only single achenia remaining, persistent at the extremity of the 

 slendcr pedicels. Of the loose acheuia those which were doubtless exterior, or be- 

 longing to the ray-flowcrs, are scarcely two lines long, linear-oblong, rather thicker 

 at the truncate apex, slightly obcompressed, smooth on the back (minutely striate 

 and scabrous), wingless, but thc thickcned edges incurved against a thick ridge of 

 the inncr face, both the cdges and ridge tuberculate-verrucose : they are terminat- 

 cd by two very short divaricate and uncinate recurved rigid awns, which are not 

 at all barbcd, and are perfcctly persistent. The disk achenia are successively more 

 narrow and slendcr, thrce to fivc lines lon^, smooth, not maro;ined, the lon^er ones 



rostrately subulate, bearing a pair of rigid and subulate awns which are divergent, 

 but not uucinate, rigid and subulate, smooth, not at all barbed or hispid. — Flower- 

 ing specimens are needcd ; but I ara confident that the plant is a Heterospermum. 



341). II. TAGETiNUM, Gra\/, n Feiidl p. 87. Valley in the mountains 35 miles 

 east of El Paso ; Oct". — I fear that this may not be sufficiently distinct from H. 

 pinnatum. It includes Greggs No. 395, from Cohahuila, and Coulter's No. 377. 

 A spccimen from New Granada has the achenia, all but the central sterile ones, 

 cqually awnless. — The awns are articulated and deciduous, as they are also in H. 

 pinnatum itself.* 



r 



Electra, DC. is to Coreopsis what Delucia, BC. is to Bidens. The central achenia are more or less 

 infertile, and in one instance I detected on them, in an authentic specimen of E. Mexicana, a pair of 

 small subulate awns, showing an affinity to Ileterospermura. It is still more allied to a genus which has 

 hltherto been very obscure, namely, Guardiola, Huml. c^ Bonpl. ; from which the exterior bractcal involu- 

 cre, tlie yellow flowers with large rays, those of the disk more hermaphrodite, and especially the glabrous 

 filaments, serve to distinguish it. We appear to have two species, which, however, are not as well marked 

 as could be desired, viz. : — 



1. Electra Mexicana {DC! Prodr. 5. p. 630) : glaberrima ; foliis lato-lanceolatis utrinque acumi- 

 natis acute serratis ; tubulo ligularum gracili glabro. 



2. E. Galeottii (sp. nov.) : pubescens, nunc glabrata; foliis oblongo-lanceolatis vel ovato-lanceolatls 

 grosse parceque serrat.s inferioribus interdum trisectis; ligulis magnis tubulo pl. m. hirto. - Cordilleras 

 Of Wexico, GaUolti, No. 2086, 2087. Mexico, Mr. Bales, Mr. Parkinson (in herb Hook ) 



In both the achenia are more or less emarginate at the apex; the exterior oval or elliptical ; the interior 

 successively longer and narrower, very flat, and apparently not maturing the seed. - Guardiola is the 

 same genus as Tulocarpus of Hooker and Arnott. I append a revised character : 



GUARDIOLA, Huml. ^ Bonpl. 



Capitulum plurlflortm. heterogamum ; IIgu1isl-5 foemineis parvis; fl. disci 5-20 hermaphroditis 

 abortu stenhbus. Involucrum nudum (ecalyculatum), tubulosum vel campanulatum, duplex ; e^terius 

 ^phy lum sutherbaceum ; mtenus e squamis 3-5 scariosis palcis receptaculi referentibus. Eeceptacu- 

 lum planum, paleis oblongo-lmearibus inter flores onustum. Flores radii et prEEsertim disci tubo pr^Iongo 

 fi! formi ; hgula obloaga 2-3-dentata discum paullo superante ; disci limbo campanulato profunde S-fido, 

 lob. hneanbus. Filamenta villosissima ! Styli rami fl. disci elongati, subukto-filiformes, hispidi. Ache- 

 nia radii oblonga leviter obcompressa basi dorso squamula^ brevi carnosul^ accreta ! Ovaria disci inania. 



