Rest Harrow.
Ononis Spinosa.
—Leguminosæ.—
Rest-Harrow (Ononis spinosa).
The Rest-Harrow or Wrest-Harrow is one of those plants whose presence in the pasture is said to indicate its poverty or the neglect of the cultivator. In Sussex and Hampshire it is known as the Cammock. It is a perennial low shrub, sometimes creeping near the ground, and at others growing more erect. The rootstock often creeps underground, a habit to which the plant owes its popular name, as it is said to be so tough as to wrest the harrow from the even tenor of its way. The more prostrate form is covered with viscid hairs; the more erect-growing plants are spiny. In the latter condition it is said that only donkeys will eat it, and hence its scientific name ononis, from onos, an ass, but it is open to question whether the ass has any fondness for it if he can get other food. The flowers are of the usual papilionaceous structure already described (see pp. [7], [43], [48], [50], [52], [72]), and may be borne either singly or in racemes. They are pink in colour; the petal known as the standard is very large in this species, and streaked with a fuller red. The pod is very small, and in the hairy form is not so long as the calyx. The flower does not secrete honey, but in spite of this fact, it seems to be chiefly if not exclusively fertilized by bees, who are evidently fooled by its resemblance to other flowers of the same form that do offer refreshment to insect visitors. The worker-bees, however, get pollen for their pains, but the males are sadly disappointed. Rest-Harrow will be found flowering in dry wastes from June to September.
There is another species, the Small Rest-Harrow (O. reclinata), an annual with spreading hairy, viscid stems, only a few inches in length, stalked rosy flowers not half the size of spinosa, and a hairy pod as long as the calyx, or longer. It is exceedingly local, and has only been reported as occurring on sandy cliffs in Devon, Wigton and Alderney. Flowering in June and July.
Agrimony (Agrimonia eupatoria).
One of the prettiest of wayside plants is the golden-starred Agrimony, growing on the waste green flanks of the road and making it beautiful. It is a perennial plant, with a short woody rootstock, and “interruptedly pinnate” leaves, somewhat resembling those of the Silver-weed, the leaflets increasing in size as they near the terminal leaflet. The flowers are borne on that kind of inflorescence called a raceme, in which each flower is attached to the central stem by a stalk of its own. Were these stalks suppressed the inflorescence would be termed a spike, and indeed some authors have so described the flower-clustering of Agrimony. The flowers are little roses, and consist of a top-shaped spiny calyx, tubular, with contracted mouth and five overlapping lobes; five golden petals, ten or more stamens, and two carpels sunk in the calyx-tube, their styles and two-lobed stigmas protruding. They do not secrete honey, and are seldom visited by insects.
As the lower fruits ripen the raceme lengthens, and concurrently the calyx-tubes harden and assume a drooping position, owing to the downward curving of their little foot-stalks.