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SUBCORYMBOSA  Kimnach & Moran, 1994 (engl./ fr.)

Series Racemosae

Type : A. Lau 030. Mexico : Oaxaca : Laguna Encantada, ca 2 km N of  Santiago Juxtlahuaca, May 1974.

Etymology : Referring  to the inflorescence.

Distribution : Mexico (Oaxaca : North of Santiago Juxtlahuaca)

 

 

First Description by Kimnach & Moran in Cactus and Succulent Journal US, 66(1): 11-15. 1994 :

Plant entirely glabrous.

Stems ca 3 (-5) cm long or more, 5 - 8 mm thick, the epidermis brown.

Rosettes 4 - 6 (-30), flattish or slightly concave above because of ascending or upcurving leaves, (3-) 4 - 6 cm wide, compact, with 20 - 35 leaves.

Leaves obovate-spathulate, cuspidate, with subobtuse, red cusp 1 mm long or less, 1.5 - 3 cm long, 8 - 25 mm wide ca 8 mm from leaf-apex, ca 6 mm wide at base, 5 - 7 mm thick ca 1 cm from apex, ca 4 mm thick near base, plane of upper surface sharply or gradually deflexed within 3 mm of apex, apical half of both surfaces obtusely keeled, dull or slightly shiny, glaucous-bluish-grey, the lower surface densely red-flecked (less so in Lau 026), the margins obtuse or slightly rounded and usually reddish.

Floral stems 4.5 - 8 (-11) cm long, ca 2 - 4 mm thick near base, 3 mm thick near apex, glaucous-pink or -red, the leaves 6 - 12, ascending, elliptic-obovate, acute, attached subventrally, bluntly spurred, 8 - 15 mm long, 4 - 7 mm wide, 2 - 5 mm thick, bluish white often tinged pinkish.

Inflorescence a raceme of 3 - 12 flowers, at first corymbose because of the long lower pedicels, the rachis 10 - 15 mm long, pedicels at first nearly horizontal, later nearly erect, 1 - 3 cm long, the lowest the longest, 1.5 mm thick at base, 2 mm thick above, each with 1 - 3 bracts along basal half, these linear-elliptical, acute, prominently spurred, 2 - 14 mm long, 1 - 3 mm wide, 0.5 - 2 mm thick.

Flowers : Calyx disc 4 - 5 mm wide, the sepals ascending, with tips ca 1 - 2.5 mm from corolla, unequal, ovate to triangular-lanceolate, acute, (2.5-) 5 - 11 mm long, (1.5-) 2 - 3 mm wide, 1 - 1.5 mm thick, reddened at apex, corolla ovoid, pentagonal with sides flattish or slightly channeled, 8 - 14 mm long, 6 - 8 mm thick, the opening 3 - 4 mm wide, petals with abruptly expanded apices, oblong, subotuse, 3.5 mm wide, often with a blunt subdorsal mucro less than 0.5 mm long, obtusely keeled dorsally, basal half or two-thirds of dorsal side reddish orange, the apical third or half yellow, ventral side yellow, rather flat except for a narrow channel and a roundish nectar pit ca 1.5 mm wide, connate for ca 1 mm.

 

Cytology : n = 29

Link to a summary of the above description in English and French.

 

Note :

Since its discovery, the type (Lau 030) has been recollected several times and though the distribution area is limited the plants are somewhat variable especially concerning the length of the corolla. Concerning Lau 026, however, no collections of differing clones have been reported. The structure of the inflorescence of the two forms is identical. 

E. subcorymbosa Lau 030 in habitat near Laguna Encantada, Oaxaca, Mexico :

E. subcorymbosa Lau 030 dans l'habitat, près de la Laguna Encantada, Oaxaca, Mexique :

 





Photos Gerhard Köhres

E. subcorymbosa
Lau 030 in cultivation :


Photo Gordon Rollason





E. subcorymbosa
Lau 026 :



Photos Emmanuelle Aubé

A different clone from Coxcatlan, Puebla :





Photos Gerhard Köhres



Photo Stefan Neuwirth




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