CALIFORNIA. 33 
involucro paullo longiores. Acheenia anguste oblonga, leviter incurva, apice truncata, tetragona, tuberculis 
numerosis rugosa, glabra. Pappi setee achenio subduplo longiores, numerose, nivee, elegantissime 
plumosee, 
A very pretty species when recent, with numerous small pinkish flowers. 
ERICACER. 
112, Arsutus Menziesii, Pursh.— DC. Prod. 7. p. 582.—San Francisco. 
There were two varieties found, one quite smooth, with the leaves nearly 
entire, the other with a few hairs on the branches and petioles, and the leaves 
more serrate ; neither were in flower, but both apparently belong to this species. 
OLEACER. 
113. Fraxinus latifolia, sp. n., petiolis villosulis, foliolis 5, lateralibus sessilibus late ovato- 
ellipticis, terminali obovato, omnibus integerrimis supra glabris subtus pilosulis, samaris elongatis 
angustis emarginatis.—San Francisco. 
Pubes e pilis patentibus mollibus sparsis constans, in petiolis ramulisque junioribus copiosa, in pagina 
inferiore foliorum rarior, precipue in venis et marginibus sita. Petioli usque ad foliolum terminale 4-6 poll. 
longi, angulati. Foliola lateralia in folio adulto 23-3 poll. longa, 2 poll. lata, obtusa cum acumine brevissimo, 
basi rotundato-cuneata, membranacea, penninervia ; terminale 3-34 poll. longum, 23 poll. latum, basi in petiolo 
angustatum. Flores non vidi. Panicule fructiferee infra folia fasciculate, foliis breviores, parce ramose, 
pedicellis ultimis 3 lin. longis. Calyx sub fructu persistens, dentatus, et fructus grossificatione fissus. Samare 
pars seminifera 7-8 lin. longa, subcylindrica ; ala 9-10 lin. longa, vix 3 lin. lata, apice profunde emarginata. 
Species /’. pubescenti affinis videtur, sed foliorum forma et pube diversa, 
APOCYNACEZ. 
114. VaxreEsta dichotoma, Ruiz et Pav. Fi. Per. ii. p. 26. t. 151.—Precisely similar to the 
South American specimens. 
ASCLEPIADIACEE. 
115. Merastetma californicum, sp. n., (Plate XVIIL) glabrum, caule filiformi volubili, foliis 
ovato-oblongis breviter acuminato-mucronatis, basi rotundato-subcordatis, pedunculis subnullis, 
pedicellis glabris, corolla laciniis ovatis intus incano-papillosis, coronz staminez foliolis lanceolatis 
acutiusculis gynostegium sessile paullo superantibus, stigmate planiusculo.—Bay of Magdalena. 
M. parvifloro simile. Folia brevius mucronata et basi seepius late subcordata. Flores paullo minores. 
K 
