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The BLACKSEED HOP CLOVER, BLACK or HOP MEDIC (Medicago lupulina),
with even smaller, bright yellow oblong heads which turn black
when ripe, lies on the ground, its branches spreading where they
leave the root. A native of Europe and Asia, it is now
distributed as a common weed throughout our area, for there is
scarcely a month in the year when it does not bloom and set seed.
It is still another of the many plants known as the shamrock.
YELLOW WOOD-SORREL; LADY'S SORREL
(Oxalis stricta) Wood-sorrel family
Flowers - Golden, fragrant, in long peduncled, small, terminal
groups. Calyx of 5 sepals; corolla of 5 petals, usually reddish
at base; stamens, 10; 1 pistil with 5 styles; followed by slender
pods. Stem: Pale, erect, 3 to 12 in. high, the sap sour. Leaves:
Palmately compound, of 3 heart-shaped, clover-like leaflets on
long petioles.
Preferred Habitat - Open woodlands, waste or cultivated soil,
roadsides.
Flowering Season - April-October.
Distribution - Nova Scotia and Dakota westward to the Gulf of
Mexico.
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