MARGINATUM Kimnach & Moran, 2002

Distribution : Mexico (Nayarit); steep rocky cliffs in (sub-) deciduous forest, 670 m, known only from the type locality.

Description (according to IHSP, 2003) :

Rosette usually solitary, with short stem 3 x 1 – 2 cm, rosette semiglobose (6-) 10 – 14 cm in diameter.

Leaves 12 – 25, young ascending, later horizontal to recurving, obovate spatulate, oldest leaves (4-) 5 – 6,5 x 2 - 3 cm, 3 – 4 mm thick, with white acuminate mucro 1,5 – 2 mm long, lamina greyish-green or reddish in strong light, with faint waxy bloom, epidermis with protruding cells but smooth to the touch, margins sharp, somewhat membranous, conspicuously whitish.

Inflorescences 1 – 4, (12-) 20 – 30 (-40) cm, ascending to horizontal, scape 4 – 9 cm, with (5-) 10 – 14 scorpioid (rarely bifurcate) zig-zag branches with (2-) 5 – 6 flowers each, pedicels 10 – 15 mm.

Flowers with musty scent, sepals acute, basally fused for 0,75 mm, 3 – 5 x ± 1mm, glaucous-green, petals deltoid-acuminate, acute, ± 10 x 3 mm, greenish-cream, apical ½ deeply grooved, with spots and parallel brownish-red bands, basal ½ with less frequent spots.

A very distinct recent discovery, especially because of its flat and typically solitary rosettes with white margined leaves.

G. marginatum is the first record of the genus from Nayarit. It appears without close relatives but is most similar to G. bartramii.