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IsoOMERIS ARBOREA. ('TREE-LIKE ISOMERS. 
Class and Order. 
HexanpriA Monoeynia. 
( Nat. Ord.—CapparivEz. ) 
Generic Character. 
Sepala basi unita subpatens marcescens. Petala 4 ob- 
longa sessilia (sub-) regularis. Torus carnosus, subhemi- 
sphericus superne dilatatus. Stamina 6: filamenta equa- 
lia (estivatione inflexa) longe exserta. Capsula magna, 
obovato-elliptica, inflata, coriacea, indehiscens, stipitata, 
stylo perbrevi subulato terminata. Semina plurima magna, 
levia.—Arbor Californica humilis vertice patente. Radix 
longe fusiformis. Folia approximata 3-foliolata. Flores 
magni, flavi, terminales, racemoso.— Tota planta odore Po- 
linisie. Nutt.in Torr. et Gr. Fl. 
Specific Name and Synonyms. , 
Isomeris * arborea. Nutt. MSS. in Herb. Hook.— Torrey 
et Gray, Fl. N. Am. v. 1. p. 124. 
This curious plant, whose blossoms at first sight consid- 
erably resemble those of a small-flowered EpWwarDsIA, Was 
discovered by Mr. Nurratx in California, and sent both to the 
Royal Botanic Garden, Edinburgh, and to that of the Cale- 
donian Horticultural Society, by Mr. Burst of Philadelphia 
in 1839. In the former establishment it has been kept in 
the greenhouse, and has not yet flowered ; in the second it 
was placed in the stove, and flowered in the beginning of 
May. Mr. James M‘Nas thinks that the flowering was 
promoted, by his having forcibly retained the top in a 
depending position. D 
ESCR. 
_* So named from icss, equal, and jspos part, in efiusion praheey: to the 
Tegular petals, and the equal length of the stamens and pistil. 
