belonging to the Natural Order Bignoniaceoe. 865 
referable to it. Every botanist knows, that the anthers in this 
family of plants are parted into two divaricately spreading, rare- 
ly parallel, or, more strictly speaking, confluent unilocular lobes. 
These lobes, in most cases, are united together at their axis ; 
but in Argylia the connection is so slight, that they appear as if 
quite distinct. In Jacaranda , however, one of the lobes is abor- 
tive, with only a faint rudiment of the other. This remark- 
able character of the anthers in Jacaranda first attracted my 
attention in examining the Jacaranda mimosifolia , which flower- 
ed last year in the hot-house belonging to the Comtesse de 
Vandes at Eayswater. At first, I was inclined to consider it as 
merely an accidental malformation of the anther ; but, from 
having afterwards found it to be an invariable structure in five 
species out of the six, which are referable to this genus, I was 
led to regard it as an important mark, not undeserving a place 
in the generic character. The only known exception is the 
Jacaranda tomentosa , wherein the anthers consist of two equal 
diverging lobes. In other respects, this species accords with its 
congeners, unless in having its leaves terminated by an odd 
pinna. The structure of the outer covering of the seed will be 
found to furnish a character of considerable importance. I shall 
here subjoin descriptions of the species belonging to this genus. 
§ Antheris unilobis, foliis abrupte bipinnatis. 
1. J. acutifolia, foliis bipinnatis subsexjugis: foliolis lineari-lanceolatis acumi- 
natis glabris, corollis sericeis : tubo recto. 
Jacaranda acutifolia, Humb. et Bonpl. PL JEquin. 1. p. 59. t. 17- Kunth in 
Nov. .Gen et Sp. PL 3. p. 145. 
Hab. prope San Phelipe, in Peru vice calidis, ad ripas fluvii Guancabamba. 
Humboldt et Bonpland. Tj . 
A rbor ramosa, 10-pedalis, cortice rimoso cinereo obducta. Rami numerosi, 
patuli, elongati, foliosi. Folia opposita, patentia, bipinnata, abrupte paucijuga 
spitliamea : pinnae altemae, per paria remote, in jugis 5 v. G absque impari 
disposite : foliolis 9-12-jugis, oppositis alternisve, lineari-lanceolatis, acumina- 
tis, glabris, fere uncialibus. Paniculae terminales, amplse, pyramidate, multi- 
florae. Calyces campanulati, 5-den tati : dentibus ovatis, acutis. Corollas magnae, 
violaceae, extus sericeae : tubus rectus fauce duplo brevior : faux dilatata, cam- 
panulata, subtus ventricosa : limbus 5-lobus, bilabiatus : lobis rotundatis, mar- 
gine paulo crispatis. Stamina 4, didynama, fertilia, per paria fornicato-conni- 
ventia ; quintum sterile, multo longius, superne villosum, inferne attenuatum 
et glabrum. Antherce unilobae, alteri lobi rudimento vix ullo. Ovarium ovale, 
compressum. Stylus filiformis, glaber. Stigma bilamellatum. Capsula lignosa, 
ovalis, compressa, subacuta, bilocularis, l)ivalvis, 2|-pollicaris, latitudine 1^- 
unciali : dissepimentum contrarium, carnosum, utrinque placentiferum. Semina 
crebra, plana, transversa, margine membranacea. 
2. J. obtusifolia , foliis bipinnatis multijugis : foliolis ovali-oblongis obtusis pu- 
bescentibus, corollis glabris : tubo arcuato fauce triplo breviore. 
Jacaranda obtusifolia, Humb. et Bonpl. PL JEquin. 1. p. G2. t. 18. Kunth in 
Nov. Gen. et Sp. Pl. III. p. 145. 
Ilab. juxta Carichana in umbrosis ad ripas Orinocco fluminis. Humboldt 
et Bonpland, Tj . Arbol del roseto Colonis, 
