Although flowers of Chimantaea resemble those of Stomatochaeta closely in
gross morphology and indument, they differ significantly in details of venation.
Typical of the genus Chimantaea is C. rupicola (fig. 108). In the corollas of
this species (fig. 108A), only lateral veins are present in the lobes. These fuse
at the lobe apices; in addition, adjacent laterals fuse beneath the sinuses, a
feature not seen in Stomatochaeta. Thus five corolla bundles, together with
adjacent stamen traces (fig. 108D) enter the achene. Stamen traces join with
these fused laterals in the achene top. In addition to the five corolline bundles,
five other exterior bundles are usually found in the achene wall (fig. 108C). In
the style (fig. 108B), the dorsiventral pair of bundles is present; a lateral pair of
smaller bundles runs from just below the point of bifurcation of the stigmatic
branches to the base of the style. The four (sometimes five) bundles of the
style connect with exterior bundles only a short distance beneath the top of the
achene (fig. 108C, E). Thus, in contrast to the taxa above, only exterior bundles
are found in most of the length of the achene. The ovule trace is simple; at its
base, its vascular supply divides to join exterior bundles (fig. 108G). At the base of the achene, as in Stenopadus and Stomatochaeta, a cylinder of vascular bundles (fig. 108H) enters the receptacle. Specimens of other species of Chimantaea (C. lanocaulis, C. mirabilis) showed a venation pattern identical to that described above for C. rupicola.