6 BOTANY OF THE VOYAGE OF THE SULPHUR. 
same genera or groups as the north-western plants. But the Lower Californian 
plants, especially the interesting collection, made at the Bay of Magdalena and 
the Cape San Lucas, are almost all either tropical or Mexican forms, but chiefly 
new as to species. The specimens, owing to the season at which the country was 
visited, were often only found in fruit, or with very young flowers, and there is no 
doubt but that, were this hitherto unexplored district examined at a period of full 
vegetation, a very rich harvest might be made. I am not aware of any South 
Californian plants having been yet published. 
In the following enumeration, the species already described are merely 
mentioned, with a reference to some work where their character may be found. 
The new species will be described as fully as the state of the specimens 
admits of. 
CRUCIFERAE. 
1. AraBis? sp. n., A. petrea affinis, sed glaberrima foliis omnibus petiolatis 
pinnatifidis.—The specimens are barely in flower, and therefore the genus is 
uncertain in this difficult order.—Stony hills 400 to 500 feet high on the Bay of 
Magdalena. 
CAPPARIDEX. 
2. Isomeris arborea Nutt. in Torr. et Gr. Fl. N. Amer. 1. p. 124.—The genus 
appears to me to be scarcely sufficiently distinct from Cleome, unless the several 
sections of that genus are separated from it.—San Pedro and San Diego. 
POLYGALACER. 
3. Kramerta parvifolia sp. n. (Plate I.) frutescens, adpresse pubescens, foliis linearibus obtusis 
vel vix acutis, pedicellis medio bracteatis paucis folio longioribus, capsula cordato-globosa subdidyma 
breviter acuminata, aculeis tenuibus apice hamulosis.—Bay of Magdalena. 
Rami divaricati, rigidi, ramosissimi. Ramuli et folia pube adpressa more Heliotropiorum canescentia. 
Folia inferiora semipollicaria, summa multo minora, sepius falcata et apice obtusa vel mucrone subrecurvo 
acutata. Flores parvi, in speciminibus suppetentibus fere omnes a vermibus exesi, sed, tanquam e fragmentis 
judicare potes, filamenta petaloidea basi interne connata videntur, a staminibus fertilibus libera. Capsula sua 
sponte indehiscens, in valvulas duas separabilis, utrinque ad suturam obscure costata, apice breviter acuminata, 
nec ut in plerisque speciebus depressa. 
