Sedum
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PUSILLUM  Michaux, 1803

Synonyms :

Diamorpha pusilla  (Michaux) Nuttall (1818) / Tetrorum pusillum  (Michaux) Rose (1905)

Tillaea cymosa  Nuttall (1818) / Diamorpha cymosa  (Nuttall) Britton ex Small (1903) / Sedum cymosum  (Nuttall) Fröderström (1936)

Distribution : E USA (S. Appalachian Highlands); granite outcrops in shallow soil, 130 - 170 m.

 

Description (according to 't Hart & Bleij in IHSP, 2003) :

Small annual herbs with erect finely ribbed stem and extremely long  hypocotyl (to 40% of the total height).

Leaves alternate, elliptic-oblong (ovate or lanceolate), rounded, minutely papillose at the tip, short-spurred, shortly petiolate, 1.6 - 4.3 x 1.1 - 1.8 mm, light green, lower leaves caducous.

Flowering branches erect, simple or branched, 2.3 - 5.8 cm.

Inflorescences terminal cymes or single flowers, bracts leaf-like, pedicels ± 2 mm, continuous with the calyx tube.

Flowers (3- to) 4- (to 7-) merous, sepals broadly sessile, broadly ovate to reniform, rounded, ± 0.5 x 1 mm, green, petals free, ovate-elliptic, obtuse, slightly channelled, white, 1.4 - 3.4 mm, divergent, filaments white, anthers dark red.

Cytology : 2n = 8




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