193 
ABRONIA ARENARIA. 
Sea-side Abronia. 
PENTANDRIA MONOGYNIA._Nat. Ord. NYCTAGINEm, Juss. 
Gen. CnxR.^PcriantJimm simplex, subhypocrateriforme, limbo 5-partit(?, 
basi tumido angulato. Staminum Filamenta 5, basi coalita in vaginu- 
1am hypogynam brevissimam, ultra agglutinata tubo perianthii coarc- 
tato, supra libera : Antherce oblonga?, inclusae. Germen \, vagiiiula sta- 
ininifera infra cinetum, in tumida perianthii basi. Stylus 1. Stigma 
incrassatum. Achenmm \, perianthio 5-angulari tectum. 
Herhacea. Folia opposita, petiolaia simpUcia. Pedunculi axillares. Flores 
capitati involucrati. 
Abronia arenaria ; foliis cordatis. 
Abronia arenaria, Menzies, MSS. 
Stem procumbent, terete, branched, succulent, brownish, viscid, the upper 
part pubescent. Leaves rather distantly placed, in opposite pairs, pe- 
tiolate> broadly cordate, thick and fleshy, quite entire, nerved, the young 
ones pubescent. Petiole scarcely so long as the leaves, rounded. 
Flowers in rather dense heads, about an inch in diameter, enclosed in a 
5-leaved involucre, of which the leaflets are ovate, green, shorter than 
the flowers, terminating an axillary pubescent peduncle, which is about 
as long as the leaves. Perianth three-fourths of an inch long. Tube 
long, greenish, pubescent, enlarged and 5-angled at the base; limb 
spreading, yellow: segments 5, obtuse, waved: base tumid, 5-angled. 
Stamens within the tube. Filaments, 2 short and 3 longer, free at their 
upper part, the middle incorporated with the tube of the perianth ; be- 
low free, uniting at the very base into a membranous cup surrounding 
the germen: Anthers oblong, fixed by their back to the top of the fila- 
ments. Pistil shorter than the tube. Germen ovate. Style filiform. 
Stigma thickened, villose. Achenia ovate, enclosed by the enlarged, 
acutely 5-angled obovate base of the perianth, and at its base by the 
united bases of the stamens, resembling a 5-toothed cup. 
The only knowledge we have hitherto possessed of the ge- 
nus of this plant, has been from individuals raised in the Bo- 
VOL. III. 
