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.

Annuals and Biennials

Includes biennials. All of these plants will also appear in one of the Camden Park catalogue categories, usually Herbaceous Plants.

Anagallis arvensis L.f. var. azurea Hyl.

Annual prostrate herb, quite variable, the flowers of azurea being presumably blue.  Probably similar to the variety caerulea.  [RHSD, Hortus].

Anagallis linifolia ‘Breweri’

A cultivar of Anagallis linifolia L. Woody annual, to 45cm, with usually blue flowers, red beneath.  [RHSD. Hortus].  The variety breweri has red flowers [RHSD].  However, this is at odds with the Floricultural Cabinet of 1850 which describes the flowers as ‘a fine large blue.’  [FC p.131/1850].  See also Anagallis linifolia ‘Splendens’ in which a red flowered form is depicted.

Anagallis linifolia ‘Splendens’

A cultivar of Anagallis linifolia L. Woody annual, to 45cm, with usually blue flowers, red beneath. [RHSD. Hortus].


Anchusa capensis Thunb.

Frost hardy, erect biennial, often grown as an annual, with small, very bright blue flowers, resembling ‘Forget-me-not’, in summer.  To 18cm.  [RHSE, Hortus].

Blumenbachia insignis Schräd.

Trailing and twining annual with palmate leaves and white flowers.  [RHSD, 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].

Calendula stellata Cav.

Frost tender annual with erect stems, usually much branched, sharply-toothed, lance-shaped leaves, to 14cm, and golden yellow to orange flowers, tipped with purple, and with violet-purple to black disc florets.  To 50cm.  [RHSD, Hortus].

Callistephus chinensis (L.) Nees

Upright summer annual with coarsely toothed leaves and very striking single or double flowers in shades of pink, red, blue, purple and white.  Variable in height, to 75cm.  [RHSD, Hortus].  There are many garden forms.

Centaurea americana Nutt.

Annual with thin, lance-shaped, usually entire leaves and rose to purplish or white flowerheads, to 7.5cm across.  To 90cm.  [RHSD, Hortus].

Centaurea cyanus L.

Fully hardy annual with dark blue to pale blue, sometimes pink or white, flower heads in spring and summer. Highly variable in height, to 80cm.  [RHSE, Hortus].

Clarkia amoena A.Nelson & J.F.Macbr. subsp. lindleyi (Dougl.) F.H.&M.E.Lewis

Fully hardy, erect annual with fluted, single or double, lilac to reddish pink flowers, with a dark red spot, in long shoots in summer.  To 75cm.  Lindleyi is a rather coarse form with lavender flowers, often streaked with white near the base, the dark red central spot often absent or represented by a small spot or line.  It can grow to 2m.  Once a very popular cottage garden plant.  [RHSE, Hortus].

Clarkia romanzovii A.Nelson & J.F.Macbr.

Perennial with lance-shaped leaves and violet-coloured flowers in summer.  To 30cm.  [RHSD].

Clarkia rubicunda (Lindl.) F.H. & M.E.Lewis

Half hardy, erect to prostrate annual with lance-shaped, sometimes toothed leaves, to 4cm long, and leafy spikes of rosy-pink to lavender flowers with a conspicuous red or red-purple base.  To 1.5m.  [RHSD].

Clarkia tenella (Cav.) F.H. & M.E.Lewis

Frost tender, erect, sometimes decumbent, perennial with branched stems, elliptical leaves to 6cm, and lavender to blue or deep red-purple flowers in summer.  To 50cm.  [RHSD].

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