Euphorbia humifusa, Willd. Euphorbia chamaesyce, L. Euphorbia chamaesyce subsp. massiliensis, (DC.) Thell.

4. E. humifusa Willd. View in CoL View at ENA , Enum. Pl. Hort. Berol., Suppl. 27 (1813).

Procumbent, glabrous, more or less glaucous annual, with 4 branches from the base; branches up to 13 cm. Leaves (2-)5-8(-9-5) x (1—)2—4(—5) mm, ovate, obtuse, asymmetrical at base, serrulate, especially in the upper half; petiole 0-5-1 mm. Stipules c. 1 mm, subulate-filiform. Glands transversely ovate to suborbicular, concave, stipitate. Capsule 1 -5 x 1 -5-2 mm, transversely rugulose, nearly smooth. Seeds 1 -2 mm, ovoid, smooth, mottled grey-brown. Stony or disturbed ground. S. Ukraine and S.E. Russia; naturalized elsewhere in parts of S. & C. Europe as a weed and ruderal. Rs (W, K, E) [Au Co?Cz Ga Ge He Hu It?Ju Po Rm Sa Si.] {W. & C. Asia.)

E. serpens Kunth in Humb., Bonpl. & Kunth, Nov. Gen. Sp. 2: 52 (1817), has smaller, entire leaves, stipules often connate, and smaller, more or less quadrangular seeds. It is native of America, and occurs frequently as a casual in S. France and Spain, where it is perhaps locally naturalized.

5. E. chamaesyce L. View in CoL , Sp. Pl. 455 (1753) View Cited Treatment .

Procumbent, glabrous or villous annual with branches up to 30 cm. Leaves (1—)3—7(— 11) x (l-)2-5^4-5(-6) mm, asymmetrically ovate-suborbicular to oblong, obtuse or emarginate, oblique at the base, nearly entire or obscurely serrulate; petiole c. 1 mm. Stipules up to 1 mm, triangular. Glands suborbicular, with small, whitish appendages. Capsule 2 x 2 mm, rather deeply sulcate, smooth, glabrous to densely patent-pubescent. Seeds 1 -2 mm, ovoid-quadrangular, irregularly tuberculate-rugulose, greyish. Open habitats. S. Europe, extending northwards to E.C. Russia. Al BI Bu Co Cr Ga Gr Hs It Ju Lu Rm Rs (C, W, K, E) Sa Si Tu.

(a) Subsp. chamaesyce :

Glabrous or pubescent. Leaves less than 10 mm, suborbicular-ovate, usually emarginate, often entire. Appendages not more than twice as wide as the glands, usually entire. Throughout the range of the species.

(b) Subsp. massiliensis (DC.) Thell. View in CoL in Ascherson & Graebner, Syn. Mitteleur. FI. 7: 457 (1917):

Villous. Leaves usually up to 10 mm, ovate-oblong to oblong, obtuse, serrulate. Appendages more than twice as wide as the glands, often 3-lobed. S.E. Europe and C. Mediterranean region. Bu Cr Gr It Ju Rm Rs (W, K) Sa Si.