360 CALIFORNIA.— SUPPLEMENT. \_Composita : 



This has quite the appearance of a Filago, but the structure of the capitulum is that of Gnaphalium in 

 every particular, except as regards the receptacle, which is here conical and densely covered with large cylin- 

 drical papillae that are concave at the apex. The filiform female florets form about two rows, within which 

 are the bisexual ones. 



1 . Senecio arnicoides. De Cand. Prod. 6. p. 426. 

 This we have not seen. 



2. S. Californicus. De Cand. Prod. 6. p. 426. 



3. S. ? flocciferus. De Cand. Prod. 6. p. 426. 



The flowers are reddish, the ligulate florets appear to be in several rows and gradually to pass into the 

 tubular ones. 



4. S. Douglasii. De Cand. Prod. 6. p. 429. 



With this we are unacquainted. 



TETRADYMIA. De Cand. Lagothamnus. Nutt. ms. 

 Capitulum homogamum pauciflorum. Involucri squama? subbiseriales, ovali-oblongse, coriaeeo-paleaceas. Re- 

 ceptaculum angustum nudum epaleaceum. Corolla tubulosse 5-fida3, lobis linearibus recurvis. Anthera- 

 exserta; ecaudatre. Styli rami teretiusculi apice incrassati cono brevi superati. Achenia erostria villosa. 

 Pappus corolla.' tubum aequans pluriserialis, pilis mollibus basi fragilibus candidissimis spinuloso-denticu- 

 latis. — Herbee vel frutices. Caules folia primaria pedunculi et involucra tomentoso-cana. Folia alttrmi 

 rigide mucronata. Capitula 5-8 ad apices caulis vel ramulorum in racemum conferta. Flosculi " lutei 

 tnulto majores guam in Senecionum genere ad guod genus nostrum accedit." 



1. T. canescens (De Cand.); herbacea, foliis omnibus linearibus planis erectis mucro- 

 nulo brevi apiculatis cano-tomentosis in axilla nullis, involucre* 4-phyllo 4-floro — De 

 Cand. in De Less. Ic. Sel. 4. t. 60 (ined.). Prod. 6. p. 440. — Lagothamnus. Nutt. Mst. 



fide herb. Dougl. 



We do not know where Douglas and Nuttall collected their specimens ; De Candolle says they are from 

 the Columbia River, but they came to us with plants from California. 



2. T. spinosa; fruticosa, foliis primariis (seu rameis) tomentosis subteretibus recurvis 

 rigidis spinoso-mucronatis senioribus glabrescentibus omnino spiniformibus, axillaribus 

 fasciculatis carnosulis glabris obtusiusculis, involucro 5-(nunc 4-)phyllo 8-floro. 



Hab. Snake Country. Mr Tolmie. 



1. Centaurea Melitensis. Linn. — DeCand. Prod. 6. p. 593 C. apula. Lam.? De Cand. 



I. c. — C. Patibilcensis. De Cand. I. c. 



Between the above three supposed species, as defined by De Candolle, we can perceive no difference. 

 C. Melitensis is said to have capitula solitary and tomentose, and the cauline leaves toothed ; in C. apula 

 the capitula are usually aggregated and glabrous, and the cauline leaves quite entire ; while C. Patibilcensis 

 has the leaves of the latter and involucres of the former. But from a comparison of specimens, from Europe, 

 the Cape of Good Hope, the Canary Isles, Monte Video, Chili, and California, these characters vary on the 

 same specimen ; and we have no doubt whatever that the species has migrated with grain from the south 

 of Europe. De Candolle refers Douglas' plant to his C. Melitensis, although the cauline leaves (in our 

 specimen) are quite entire. 



