constituted of trichomes glandular or tector, present or absent.
The dense indumentum
with its polyphenol content may replace the protective role of the epidermis in some young xeromorphic leaves.
Frutex 2-4 m altus; cortex brunneo-rubellus ad griseus leviter fisuratus; ramuli teretes ad leviter compressi hirtuli vel pilosi, hoc indumentum
persistens ut in petiolo, costa, nerviis lateralibus et inflorescentia.
squamosa is differentiated by the following characters: petiole with clustered scale-like indumentum
and presence of fuzzy tomentum, scarce and deciduous, mainly in the midrib.
2-1 mm long, wooly, dendritic, rusty brown hairs with well developed axis and moderate number of terete short to moderately long arms (Wurdack 1980, indumentum
type 26), persistent; Mature leaves of each pair equal in size, 3.
Based in the morphological diagnostic features usually considered for taxa delimitation in the genus (embryo type, stamen and style height and shape, life-form, inflorescence type, presence and size of stipules, calyx and leaf shape and indumentum
, flower colour) and chromosome number, Lopez-Gonzalez (1992, 1993) considered the genus Helianthemum to be integrated by two taxonomic entities at subgenus rank (without ruling out the existence of two separated genera: Helianthemum and Rhodax, Spach 1836, Markova 1975) and seven Sections: Argyrolepis (n = 5), Lavandulaceum (n = 10), Helianthemum (n = 10), Brachypetalum (n = 10) and Caput-felis (n = 12) in subgen.
chichicara, but the two are so different in habit, indumentum
, and fruits that justify their recognition as distinct species.
It is variable in size and indumentum
of culms, leaves, and panicles.
longissimiflora, although there were some important differences with the description, like the plant not (yet) forming a stem, an at least half-superior ovary and glandular indumentum
The most useful features are the presence and distribution of the indumentum
Primas pronunciou, por exemplo, a ultima parte de indumentum
da mesma maneira que emptum.