CALIFORNIA. 29 
94. Acoma dissecta, gen. nov. Verbesinearum (Plate XVII.)—Cape San Lucas. 
Cuar. GEN. Capitula ovoidea, pluriflora, radiata. Involucrum imbricatum, squamis paucis 
latis obtusis. Receptaculum parvum, planum; palez lanceolate, acute. Flores radii 1-2, foeminei, 
fertiles; disci plures, hermaphroditi, tubulosi, 5-dentati. Styli rami appendice sublanceolata acuta 
vix puberula terminati. Achznia obcompressa, bialata, apice emarginata, calva; interiora sepe 
abortiva. 
Species unica; A. dissecta, Suffrutex 1-1} pedalis, glaberrimus, a basi ramosus. Folia opposita, 
petiolata, bipinnatisecta ; segmentis linearibus acutis integerrimis crassiusculis, superioribus subconfluentibus. 
Corymbi longiusculi pedunculati, oligocephali. Capitula 3 lin. longa. Involucrum fere Latreillew vel 
Clibadii, squame circa 5, valde imbricate, Jeeves, extime paullo breviores. Ligula szepius solitaris, tubo 
gracili, lamina oblonga 5-nervi apice vix emarginato-dentata. Palez floribus disci paullo breviores. 
The deeply cut, narrow, somewhat fleshy leaves give this plant the habit of 
some Senecios and Chrysanthema. The heads of flowers have some resemblance 
to those of Clibadium and Latreillea, but the flowers of the disk are hermaphro- 
dite though often sterile. The genus would, therefore, belong to the Verbesinee, 
amongst which none are published with the same combination of characters as in 
our plant. 
Plate XVII. fig. 1, floret of the ray ; fig. 2, floret of the disk and palea; fig. 3, anthers; fig. 4, 
style; fig. 5, acheenium, all magnified. 
95. Dysop1a anthemidifolia, sp.n., erecta, glabra, foliis pinnatisectis, segmentis remotis lineari- 
bus integerrimis, involucri ebracteati hemispherici squamis 8 apice obovato-scariosis,—Bay of 
Magdalena. 
Herba annua, pedalis, habitu fere Anthemidis cotule. Folia alterna vel infima opposita, 1-2-pollicaria, 
anguste linearia, crassiuscula, glabra, Jaciniis utrinque 2-4 inter se distantibus 3-6 lin. longis. Glandule 
orbiculatze, hinc inde ad apices foliorum vel laciniarum solitarie ; folii apex glandulifera seepius paullo dilatata 
et mucronulata, Pedunculi terminales, superne parum incrassati, monocephali, bracteis paucis parvis linearibus 
sparsis a capitulo remotis. Capitula hemisphzerica, radio neglecto 6-7 lin. diametro. Involucrisquame glaberrime 
leeves, basi incrassato-cartilaginese, superne membranacee, apice late, obtusissime, scariose, dorso glandulis 3-4 
majusculis onustz. Ligule 8, lamina ovata obtusissima, Flores disci numerosi, involucrum paullo super- 
antes; corolla tubulosa basi breviter attenuata, fauce elongato-tubulosa, dentibus 5 lanceolatis acuminatis. 
Genitalia inclusa. Styli rami apice truncati penicillati. Achenia lineari-turbinata, basi pedicello brevissimo 
hispido stipitata, striata, sparse puberula, apice truncata. Pappus achzenio sublongior, constans e squamellis 
numerosis (circa 20) basi in annulum brevissimum subcoalitis, ultra medium in setas plurimas barbellatas 
fissis. 
This very distinct species cannot be referred to any of De Candolle’s sec- 
tions. The want of bractee under the involucre would place it in Gymnolena, 
but the habit, the foliage, and the form of the involucre are totally different from 
those of D. serratifolia. Our plant has, however, all the essential characters of 
the genus Dysodia. 
96. PoropHyLLuM gracile, sp. D., suffruticosum, glabrum, foliis oppositis alternisque anguste 
linearibus integerrimis, glandulis paucis vel nullis, involucri cylindracei squamis muticis margine 
anguste scariosis, acheenio rostrato scabriusculo,—Bay of Magdalena. 
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