(45) 
backward, pale green, smooth; flowers terminal, solitary, short- 
pedu incleds inconspicuous; sepals leaf-like, obtuse, 2-3 mm 
long; petals pale yellow, twice the length of the sepals, ovate, 
acute, or even apiculate; stamens 10, much shorter than the petals. 
Living specimens collected in state of Mexico by J. N. Rose 
(no. 248), and flowered in greenhouses of Department of Agricul- 
ture, and of New York Botanical Garden, December, rgo1. 
SEDELLA Britton & Rose, gen. nov. 
Diminutive Californian annuals, with small ovate to ovate-oblong 
leaves and small yellow cymose flowers. Calyx with 5 very small, 
triangular acute teeth. Petals linear to ovate-lanceolate, united at 
the base, spreading (?) Stamens1o. Carpels oblong, 1-seeded, the 
seed erect. 
Type species, Sedum pumilum Benth. 
1. SEDELLA PUMILA (Benth.) Britton & Rose. 
Sedum pumtlum Benth. Pl. Hartw. 310. 1849. 
California. 
2. SEDELLA Concpon! (Eastw.) Britton & Rose. 
Sedum Congdoni Eastw. Proc. Cal. Acad. ITI. 1: 135. pl. rz. 
1898. 
Grant’s Springs, Mariposa County, California. 
The Flora of the Matawan Formation (Crosswicks Clays). 
By EDWaRD W. BERRY. 
INTRODUCTION. 
Some of the earliest of American geological writings refer 
to the New Jersey Cretaceous, and the accessibility of this 
area has ever since made it a favorite field for investigation. 
Interest for a long time centered about the marl deposits and 
those of the plastic clays because of their economic impor- 
tance; the present Matawan formation was included in the 
‘‘ plastic clay and sand formation” of the geologists of the 
first half of the nineteenth century, and their stratigraphic posi- 
tion was considered to be Lower Cretaceous by Rogers in his 
first report published in 1840, although they were not clearly 
