Hypericaceae . . . . St. John's Worts
Select from 3 options:-
Plants with hairy stems and leaves:
Herbs with hairless stems and leaves
Woody plants/small shrubs:
Hypericum . . . St. John's-worts
Hypericum androsaemum . . . Tutsan
Flowers c.2cm; 3 styles (c.f. 5-8 cm fls and 5 styles in H. calycinum, Rose-of-Sharon)
Hypericum calcynum . . . . Rose-of-Sharon
A woody plant, much planted and scattered through UK; <60 cm, little branched, fls > 5cm, sepals = petals
Other woody spp. include: Hypericum forrestii (Forrest's Tutsan) is taller, non-suckering with unridged stems; scattered escape across BI. Hypericum xylosteifolium (Turkish Tutsan) is a thicket-forming shrub
Hypericum elodes . . . Marsh St. John's-wort
A marsh plant; very hairy with very pale trumpet-shaped flowers
Hypericum hircinum . . . . . Stinking Tutsan
To about 1.5 m; A garden escape naturalised throughout BI exc. N Sc
Hypericum hirsutum . . . Hairy St. John's-wort
Hairy stem and leaves; sepals (and pale yellow petals) with stalked black dots
Hypericum humifusum . . . Trailing St. John's-wort
A slender plant with sepals unequal (3 large and 2 small)
Hypericum linariifolium . . . Toadflax-leaved St. John's-wort
Rare in CI, SW En and Wa; black glands at edge of lvs and stalked on sepals
Hypericum maculatum . . . Imperforate St. John's-wort
Distinguished by leaves with square stems, no "holes" when looking to the light, and many black glands on leaves and petals
Hypericum perforatum . . . Perforate St. John's-wort
Note clear spots in leaves when viewed against the light, round stems with 2 lines of hairs; lvs with black glands
Hypericum pulchrum . . . Slender St. John's-wort
Lvs widest at base, without black glands
Hypericum tetrapterum . . . Square-stalked St. John's-wort
In wet meadows and riverbanks; lvs with transparent glands; stems winged; petals not red-tinged
Hypericum x desetangsii . . . Des Etang's St John's-wort
Two winged and 2 lesser ridges on stems; scattered in woodland/grassland across Br, rare in Ire
Hypericum x inodorum . . . Tall Tutsan
Widely planted, but unusual as an escape; much branched shrub to 2.5 m with 2-ridged stems
Other Hypericum spp. include H. montanum (Pale St John's-wort) no black dots on petals, on Alkaline soil En & Wa and the rather rare Wavy St. John's wort H. undulatum (in SW En and W Wa)
