Tab. 4296 . 
ECHINOCACTUS Williamsii. 
Mr. Williams Echinocactus. 
Nat. Ord. Cacte.®.—Icosandkia Monogynia. 
Gen. Char. (Vide supra. Tab. 4190.) 
Echinocactus Williamm ■, humilis csespitosus turbinatus inferne teres trans- 
versim cicatricatus cinereo-fuscus supeme umbilicato-depressus glaucus 
6—8-costatus, costis latis eonve\is parce tuberculatis inermibus pulAdlbgeris, 
pulvillis e piUs fasciculatis densis erectis formatis, floribus panudis subsoli- 
tariis albo-roseis. 
Echinocactus Williamsii. “ Lemaire, ex Salm-Dyck in Otto et Dietr, Allgem. 
Gartenzeit, xiii. p^ 385.” Walp. Repert. v, 5. p. 816. 
A neatly-formed species, which has a very pretty appearance 
when its starry blossoms are expanded. We received several plants 
of it at the Royal Gardens of Kew, through the favour of the 
Real del Monte Company, from the rocky Mils of their district 
of mines in Mexico, with many other treasures. It flowers in 
the summer months. 
Descr. Out largest plants do not much exceed the size re¬ 
presented. They grow in a tufted manner dnd are often pro¬ 
liferous, as in the instance here shown: the parent plant hMng, 
as it were, stifled or subdued by its offspring. Each individual 
is turbinate: from the base to the crown, or summit, terete, 
of an ashy brown colour, and scarred with close transverse line^ 
occasioned, it would appear, by the pro^essive withering ^d 
contraction of the tubercles: the summit is broadly convex, but 
with a deep depression in the centre, glaucous, traversed from 
the centre outwards by 6-8 furrows, and thus divided into as 
many convex ridges, and these again, transversely, but more or 
less deeply, into rather large, rounded, more or less confluent 
unarmed tubercles, each of which has a dense tuft or ^ort 
pencil of compact erect hairs:—no aculei. ¥l(ywers proceed froin 
a young tubercle, near the centre of the crown. The base of 
