IMPERFORATE ST JOHN'S-WORT

Hypericum maculatum

St John's-wort Family [Hypericaceae]

month8jul month8july month8aug month8sep month8sept

status
statusZnative
 
flower
flower8yellow
 
inner
inner8orange
 
morph
morph8actino
 
petals
petalsZ5
 
stem
stem8square
 
toxicity
toxicityZlowish
 
rarity
rarityZrare
ssp. maculatum
sex
sexZbisexual
 

18th Aug 2018, a private woods, Burscough, Lancs Photo: © RWD
Hairless and erect, standing to 60cm high with underground rhizomes. (Your Author was holding one up here for botanical reasons; it doesn't grow this tall!). Branches at angle of ~50° to main stem. The reader might also perceive some narrow flanges on the stem (which also looks round here instead of being square!).


18th Aug 2018, a private woods, Burscough, Lancs Photo: © RWD
But the stem is definitely square here!


18th Aug 2018, a private woods, Burscough, Lancs Photo: © RWD


18th Aug 2018, a private woods, Burscough, Lancs Photo: © RWD


18th Aug 2018, a private woods, Burscough, Lancs Photo: © RWD


18th Aug 2018, a private woods, Burscough, Lancs Photo: © RWD


18th Aug 2018, a private woods, Burscough, Lancs Photo: © RWD


18th Aug 2018, a private woods, Burscough, Lancs Photo: © RWD
Black dots on leaves. Stems square here.


18th Aug 2018, a private woods, Burscough, Lancs Photo: © RWD
The fruits


18th Aug 2018, a private woods, Burscough, Lancs Photo: © RWD
But here the same stems are round with 2 wings! Does not compute! Does not compute!


18th Aug 2018, a private woods, Burscough, Lancs Photo: © RWD
The stems are square (as they are also on Square-Stalked St John's-Wort).


18th Aug 2018, a private woods, Burscough, Lancs Photo: © RWD


18th Aug 2018, a private woods, Burscough, Lancs Photo: © RWD
But here the same stems are round with 2 wings! Does not compute! Does not compute!


18th Aug 2018, a private woods, Burscough, Lancs Photo: © RWD
Imperforate means no perforations in the leaves. But there should be black dots on the leaf periphery of Imperforate St John's-wort. Anyway, your Author was told that this IS Imperforate St John's-wort, and it conforms no less and no more than Imperforate St John's-wort on another wildflower website.


Easily confused with : Flower () [plants with similar names belonging to differing families]

It comes in 2 sub-species :

  • (Hypericum maculatum ssp. maculatum) which is sparsely branched, with the branches subtending an angle with the main stem of 30° the leaves lacking transparent glands; the sepals 1.8 to 3mm wide with the tip entire (not toothed), black glands on petals mainly as flat dots. Sparsely scattered over Scotland; rarer in England. [RRR]
  • (Hypericum maculatum ssp. obtusiusculum) which is more branched, with the branches subtending an angle with the main stem of about 50° the leaves usually possessing transparent grands; the sepals narrower at only 1.2 to 2mm wide with the tip toothed; black glands on petals mainly as flat lines. Much more common than ssp. maculatum and locally frequent. This sub-species is often treated as a separate species!
Thus, the above specimen from the private woods near Burscough junction seems to be that of ssp. maculatum although the leaves seem to lack the requisite transparent glands(!) and the sepals are quite broad! (rather than narrow) without a toothed tip! There's nowt so strange as plants!


  Hypericum maculatum  ⇐ Global Aspect ⇒ Hypericaceae  

Distribution
 family8St John's-wort family8Hypericaceae
 BSBI maps
genus8Hypericum
Hypericum
(St John's-Worts)

IMPERFORATE ST JOHN'S-WORT

Hypericum maculatum

St John's-wort Family [Hypericaceae]