Echeveria
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MACDOUGALLII  Walther, 1958 (engl./ fr.)

Synonym : Echeveria sedoides  E. Walther (1958)

Series Nudae

Type : T. MacDougall B.15, collected at Tres Cruces, between San Miguel Tenango & Santo Domingo

Tehuantepec, on and between rocks, 6 Feb. 1939, 4'000 ft. CAS 268 566.

Etymology : Named for its discoverer, Thomas MacDougall.

Distribution: Mexico (Oaxaca).

First Description by E. Walther in Cactus and Succulent Journal (US) 30: 87. 1958 :

 

Plants glabrous, subshrubby, with numerous ascending or spreading branches, to 12 cm tall or more.

 

Leaves many, subrosulate or closely aggregated along upper portion of stems, spreading to reflexed, oblong-obovate to obovate, cuneate, thick-clavate, more or less subterete or faintly subangular and keeled, bluntly pointed, upcurved, not conspicuously papillose, to 3 cm long or more, 10 mm thick.

 

Inflorescence spreading or ascending, equilaterally-racemose, often less than 10 cm long; peduncle slender, flexuose; bracts similar to leaves but smaller, 18 - 25 mm long, widely spreading, obliquely pointed, rather readily detached.

 

Flowers often only 5 or fewer, less often as many as 10; pedicels 6 mm long or less, with 2 linear bractlets that are 2 - 5 mm long, only rarely with more than a single flower.

 

Sepals subequal, longest to 10 mm long, elliptic-oblong, nearly terete, obtusish, ascending to spreading; corolla nearly straight, pentagonal, to 18 mm long, 12 mm in basal diameter, 6 - 7 mm wide at mouth; petals only slightly spreading above when grown out-of-doors, but often widely flaring when grown in a greenhouse; carpels to 12 mm long; nectaries narrowly-lunate, about 2 mm wide.

 

Colour : Leaves oil- to cosse-green, in sun tinged oxblood-red at edges and apex; peduncle chrysolite-green; bracts as the leaves, or more absinthe-green; sepals kildare-green tinged deep-corinthian-red; corolla peach-red to spectrum-red on outside, lemon-chrome inside; carpels bittersweet-pink; styles corinthian-purple; nectaries straw-yellow.

Cytology : n = 19, 34, 40, 42, 50

Note :

J. Pilbeam, Echeveria, p. 166, fig. 209 most certainly does not show E. macdougallii, to prove the contrary the flowers of this plant would be necessary.

 

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



The photo shows the region where Thomas Macdougall discovered the Echeveria later named for him.

The type locality of E. macdougallii  is situated between San Miguel Tenango and Tehuantepec.

The type locality of E. sedoides is San Bartolo Yautepec.

Moran 7743 is another locality where E. macdougallii has been found.

Santiago Lachiguiri - mentioned in Pilbeam, The genus Echeveria, p. 318 - is the locality of a plant vegetatively somewhat differing from either E. macdougallii or E. sedoides, however with corresponding flowers. 

Pilbeam listed the E. macdougallii localities thus (p. 166) :

"Reported from Mexico, Oaxaca, Cerro Tres Cruces, Tenango; Palacio San Bartolo Yautepec, at 1400m (E. sedoides); 2 km north of Juxtlahuaca, on an exposed ridge; near Tehuantepec and much further south-west near Santiago Lachiguiri." And regarding Santiago lachiguiri (p. 318) he wrote : "...  in south-east Oaxaca, well away from previous reported localities for E. macdougallii ...".

As the above map shows, Santiago Lachiguiri is neither "further south-west" nor "well away" from the known localities. It is quite obvious that Pilbeam ignored the geography of E. macdougallii.


In habitat :





Oaxaca, Camaron-Nejapa-San Miguel ridge before Agua Blanca
Photos © Ralph Mangelsdorff



Photos Kim Holbrook



E. madcougallii at Lachiguiri :





Photos Gerhard Köhres


In cultivation :





There is also a crested form :


Photos Emmanuelle Aubé


Photo Noelene Tomlinson





Photos Bernie DeChant

E. macdougallii 'Sedoides' :




Photo Noelene Tomlinson




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