4 Ammobroma^ a New Genus of Plants, 
lobes short and emarginate. Stamens 6-10, inserted above the middle 
of the tube of the corolla in a single series, included ; filaments very 
short ; anthers oblong, 2-celled ; the cells opening longitudinally. 
Ovary oblate-globose, 15-20-celled ; the cells arranged in a marginal 
circle around a thick central axis ; style elongated, rather stout, straight, 
included ; stigma sub-capitate, depressed in the centre, the margin cre- 
mate. Ovules single in each cell and fixed to the inner angle, at 
first nearly hemitropous, but becoming anatropous; the micropyle supe- 
rior. Fruit (immature) depressed, the dehiscence apparently localicidah 
Endocarp chartaceous, separating readily from the rest of the fruit, which 
is apparently somewhat fleshy. Plant herbaceous and fleshy, of a 
dull orange color, parasitical on the roots of an unknown shrub. Stem 
simple, scaly, almost entirely buried in the sand, the summit expanded 
into a shallow cyathiform head or receptacle, which is densely lined with 
small, pedicellate, purplish ebracteate flowers. 
AiiSfu^liTOisia 
Plate I. 
Habitat — of Sonora, JSTorthern Mexico, in the sandy 
desert near the head of the Gulf, on hills around Adair Bay. 
Boot consisting of thick tortuous ^fibres, dilated near the extremity, 
where they are attached to the plant from which the parasite draws its 
nourishment. Stem 2 to 4 feet long, and from three- fourths of an inch 
to an inch and a half in diameter, thicker below, and gradually tapering 
upwards, furnished with numerous lanceolate acute scales, which are 
appressed, except near the top and on the under side of the cup-like 
receptacle, where they are reflexed. This receptacle is about two inches 
in diameter, funnel-form inside, with the margin recurved, and the cavity 
and margin densely lined with flowers, which stand on short pedicels, 
which "are longer in the centre flowers, so that the mass of flowers is 
nearly level or only slightly concave. The inflorescence appears to be 
centrifugal. Calyx 10-parted nearly to the base; the divisions very 
slender, purplish, clothed with spreading simple or bifid white hairs 
which appear torulose under a lens. Corolla about 4 lines long, nearly 
