The involucral bract and bracteoles
of the staminate flower have a single-layered epidermis on both surfaces (see Figure 2A, B).
Inflorescences simple, without vegetative leaves, mostly borne on leafy stems but occasionally on leafless stems, in axils of current leaves or after fall of the subtending leaf, 1.5-6 cm long, containing 6-8(12) flowers with the flowers decussate or distally in no consistent order, the axes densely and persistently velutinous or tomentose or occasionally loosely sericeous; bracts 1.5-5 mm long, triangular or ovate, abaxially tomentose, adaxially glabrous, eglandular; peduncle 1-3 mm long; bracteoles
like bracts but smaller, 1-2 mm long, one of the pair usually bearing a large abaxial gland; pedicel 3-7 mm long.
Andean types generally tend to have larger leaves with ovate or lanceolate central leaflets and lanceolate or triangular bracteoles
, longer internodes in the main stem, larger seeds, a stripeless standard on white flower, and a central pod beak position.
Inflorescences terminal or axillary, usually indeterminate and often racemose, with variously developed bracts and usually a pair of bracteoles
, these sometimes recaulescent, replacing calyx lobes; flowers pend ulous to erectly held, articulated with pedicel or not.
shape showed a similar distribution: most of the Andean landraces were ovate (a Mesoamerican category), with only 10 of the 49 landraces in this group showing the Andean categories triangular or lanceolate.
Fruits of Astrophytum are not fleshy, they are almost dry, and they are covered with dense areolar wool and spinescent bracteoles
(Anderson, 2001; Powell et al., 2004).
reaching beyond the base of the flower, persistent.
Staminate inflorescences also posses characters which distinguish Aphandra natalia from the other, closely related, genera Ammandra and Phytelephas; the staminate flower cluster contains additional bracteoles
, which may induce a more branched staminate cluster (Barfod & Uhl, 2001).
Upon closer observation with flash photography, I found that moths fed on the extrafloral nectaries (EFN) located on the bracteoles
of the plants (Fig.
The broad lavender-coloured margins of the bracteoles
, resembling in colour the flowers of some species of Statice, candied all over with white scurf, harmonize with the deep violet petals, and thus avoid that sharp contrast in colour so often found in the inflorescence of plants of this order".