Graptopetalum
General Information   |   Species   |   Hybrids

PENTANDRUM  Moran, 1971.

Distribution : Mexico (Michoacán); shady rock cliffs, 1200 m

 

 

Description (according to IHSP, 2003):

 

Shrublets; stems first erect, later ± decumbent, stiff, strongly woody, branched predominantly from the base, to 15 x 0,3 – 0,6 cm, dull green, strongly glaucous.

 

Rosettes lax, 6 – 8 cm in diameter, with 12 – 35 leaves scattered over 1 – 9 cm.

 

Leaves spreading to somewhat recurved, mostly obovate, cuneate, obtuse to rounded with an inconspicuous mucro, 2 – 4 (-5,5) x 1,5 – 2,3 cm, 5 – 8 mm thick, first bluish-glaucous-pruinose, later yellowish-grey, mostly ± with a lavender hue.

 

Inflorescences spreading for 2 – 8 cm below the branch tips, 20 – 35 cm, slender, thyrses 12 – 20 cm with 3 – 4 spreading simple or 2x furcate slender scorpioid 10 – 15 cm long branches with 7 – 10 flowers each, pedicels 17 – 23 m.

 

Flowers 5- merous, calyx cup-shaped, 4 – 4,5 x 4,5 – 5 mm, glaucous-pruinose, sepals appressed, narrowly ovate, ± acute, almost equal, 3,5 – 4 x 1,5 mm, corolla 17 – 18 mm in diameter, petals 5 – 7 x 1,75 – 2,75 mm, yellowish-white, tube 3 – 3,5 x 4 mm, lobes triangular, acute, basally with a continuous dark red stripe, upper ½ almost completly dark red; only the 5 episepal stamens present.

Cytology : n = 32

 

Distinguished from all other species by having only 5 stamens as well as long slender inflorescence branches and pedicels.

It appears to be most closely related to G. amethystinum and G. paraguayense according to the protologue.





Photos Margrit Bischofberger



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