110 PLANTS WRIGHTIAN^. Y. 



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

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

 gius aristatis, central! persistente majore ; aristis subvdatis persistentibus Igevissimis 

 divergentibus vel recurvis. — Plains between the Guadalupe Mountains and tbe 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 

 slender pedicels. Of the loose achenia those which were doubtless exterior, or be- 

 longing to the ray-flowers, 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 the thickened edges incurved against a thick ridge of 

 the inner face, both the edges and ridge tuberculate-verrucose : they are terminat- 

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

 at all barbed, and are perfectly persistent. The disk achenia are successively more 

 narrow and slender, three to five lines long, smooth, not margined, the longer ones 

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

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

 ing specimens are needed ; but I am confident that the plant is a Heterospermum. 



349. H. TAGETiNUM, Gray, PI. FencU. 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 Gregg's No. 395, from Cohahuila, and Coulter's No. 377. 

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

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

 pinnatum itself.* 



* Electra, DC. is to Coreopsis what Delucia, DC. 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 Heterospermum. It is still more allied to a genus which has 

 hitherto been very obscure, namely, Guardiola, Humb. Sf Bonpl. ; from which the exterior bracteal involu- 

 cre, the 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. Electka 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-lanceolatis 

 grosse parceque serratis inferioribus interdum trisectis ; ligulis magnis tubulo pi. m. hirto. — Cordilleras 

 of Mexico, Galeolti, 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, Humh. ^ Bonpl. 



Capitulum pluriflorum heterogamum ; ligulis 1 — 5 foemineis parvis ; fl. disci 5 — 20 hermaphroditis 

 abortu sterilibus. Involucrum nudum (ecalyculatum), tubulosum vel campanulatum, duplex ; exterius 

 triphyllum subherbaceum ; interius e squamis 3- 5 scariosis paleis receptaculi referentibus. Receptacu- 

 lum planum, paleis oblongo-linearibus inter flores onustum. Flores radii et prsesertim disci tube preelongo 

 filiformi ; ligula oblonga 2- 3-dentata discum paullo superante ; disci limbo campanulato profunde 5-fido, 

 lobis linearibus. Filamenta villosissima ! Styli rami fl. disci elongati, subulato-filiformes, hispidi. Ache- 

 nia radii oblonga leviter obcompressa basi dorso squamulte brevi carnosulte accreta ! Ovaria disci inania. 



