Colin Mills, compiler of the Hortus Camdenensis, died in late November 2012 after a short illness. As he always considered the Hortus his legacy, it is his family's intention to keep the site running in perpetuity. It will not, however, be updated in the near future.

Succulents and Cacti

Agave americana L.

Frost-hardy, succulent perennial with rosettes of spreading, lance-shaped, spine-tipped, grey-green leaves, to 2m long, and panicles up to 8m long, bearing clusters of yellowish-green flowers in summer.  [RHSE, Hortus].


Agave americana L. var. marginata

Agave americana L. was first botanically described by Linnaeus in 1853 [Sp. Pl. p.323/1753]. There are a number of variegated forms, with yellow or white leaf margins, e.g. marginata, or yellow or white striped leaves, mediopicta and striata.  [RHSE]. Macarthur’s variegata is most likely to be marginata.   


Agave boscii (Hornem.) ined.

Short-stemmed Agave with a dense rosette of narrow dark green leaves, to 60cm, some times with fine marginal hairs, and a flowering spike to about 5m, bearing pairs of greenish flowers, flushed red or purple above.  [].

Aloe ferox Mill.

Stemmed aloe, to 4m, with a rosette of thick, tapering leaves, keeled at the back, glaucous, with reddish teeth along the leaf edges and backs, with ornage flowers on a branched inflorescence.  [RHSD, Hortus].

Aloe haworthioides Baker

Aloe haworthioides Baker is a frost tender, stemless, suckering succulent with rosettes of lance-shaped, fleshy, grey-green leaves with white marginal teeth, to 6cm long, suffused with red in drought, and terminal racemes, to 30cm long, of tubular orange flowers in summer.  To 6cm.  [RHSE].


Aloe succotrina Lam.

Aloe with stems to 1.2m, the leaves gradually tapering, pale coloured or glaucous with small white teeth and sometimes blotched at the base, the flowers red in a loose spike, to 30cm high.  [RHSD, Hortus].

Aptenia cordifolia (L.f.) Schwantes

Frost tender, freely branching, succulent perennial with broadly ovate, bright green leaves and solitary red-purple flowers in summer or autumn.  To 5cm, spreading. A useful plant as a soil-binder.  [RHSE, Hortus].

Calandrinia ciliata DC. var. menziesii (Hook.) Macbr.

Calandrinia ciliata var. menziesii is an annual with fleshy, linear, grey-green leaves, to 10cm long, on spreading, erect stems and solitary, axillary, crimson, rose-red, occasionally white, flowers in late summer.  To 60cm.  [RHSD, Hortus].

Calandrinia discolor Lindl.

Annual or perennial, leaves purple beneath, flowers bright light purple, to 5cm across in long racemes.  To 45cm.  [RHSD].

Cereus ferox Haw.

Frost tender, branching, columnar, heavily armed cactus which forms clumps or clambers over rocks, the flowers produced along one side of the stem.  [RHSD, Don].

Cereus hexagonus (L.) Mill.

Frost tender, large, columnar or tree-like, erect cactus, usually with 6 strong ribs, short, variable, brown prickles, and solitary flowers, to 29cm long, reddish outside and white inside, followed by dark purple fruits.  To 15m.  [RHSD, Hortus].

Cotyledon orbiculata L.

Frost tender, shrubby, erect, freely-branching succulent with thick, fleshy stems, white-frosted-waxy, white or grey leaves, and long inflorescences of tubular, red, or yellowish red flowers in summer and autumn.  To 1m.  [RHSE, Hortus].

Crassula acutifolia Lam.

Frost tender, succulent, evergreen perennial with erect, sometimes decumbent, branched stems, with opposite, lance-shaped, fleshy leaves, compressed to round in section, and cream flowers in summer.  To 1m.  [RHSD, Hortus].

Crassula ciliata L.

Small herbaceous plant with rounded, grayish, succulent leaves and flower spike bearing a terminal raceme of tiny yellowish flowers.  [Plantarum historia succulentarum].

Crassula falcata Wendl.

Erect succulent with a leafy base, sickle-shaped grey leaves and flat terminal corymbs of scarlet flowers.  To 60cm.  [RHSD, Hortus].

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