MACDOUGALLII  Walther, 1958

Synonym : Echeveria sedoides  E. Walther (1958)


Series Nudae


Type : According to the respective herbarium sheet CAS 268566, the type is a plant from Victor Reiter, received from MacDougall 1938, but it is not T. MacDougall B.15.


Etymology : Named for its discoverer, Thomas MacDougall.


Distribution: Mexico (Oaxaca).



Description by Reid Moran of a plant from habitat : 


Caudex erect, 11 cm tall, 8 mm thick, somewhat branching, reddish.


Rosette 3 cm wide, of ca 15 leaves, crowded.


Leaves elliptic-oblanceolate, acute, to 15 x 9 x 4 mm.


Floral stem 9 cm tall, 3.5 mm thick, with ca 15 leaf scars, raceme 3-flowered, pedicels 5 mm long x 1.5 mm. 


Flowers : Calyx disk 3 - 4 mm wide, the segments wide-spreading, nearly equal, elliptic, acute, 6 - 9 x 2 - 3 x 1.5 mm, corolla 11 - 12 mm long, 8 mm wide at the base, 4 mm wide at the apex, red, with yellow on covered edges.


Cytology : n = 19, 34, 40, 42, 50


Note :

1. E. Walther's description (Echeveria, 302 - 304, 1972) is of no use because made from a plant of unknown origin.


2. Pilbeam, The genus Echeveria, p. 166, fig. 209, 2008, most certainly does not show E. macdougallii, to prove the contrary the flowers of this plant would be necessary.



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


The collection locality of MacDougall B.15 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 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

Echeveria macdougallii 'Sedoides' :

Photos Noelene Tomlinson

Photos Santino Rischitelli

A somewhat different form of E. sedoides :

E. macdougallii ‘Lachiguiri’ with somewhat smaller leaves :

At left E. macdougallii, at right E. macdougallii ‘Lachiguiri’ :

Photos Margrit Bischofberger

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