. Introduction to botany. Botany. 72 Introduction to Botany. EUPHORBIACE^. Spurge Family. ,*=â¬* Herbs, sometimes shrubs or trees, with millcy secretions. Flowers monoecious or dioecious. Flowers mostly apetalous, and sometimes much reduced and subtended by an involucre, which resembles a calyx. Stamens few to many, filaments some- times united. Ovary usually 3-celled, with 1-2 ovules in each cavity. Fruit usually a 3-lobed capsule, dehiscing elastically when mature. (Fig. 349.) I. EUPHORBIA. Spurge. (Named for Euphorbus, physician to King Juba.) Flowers without a calyx and clus- tered in a cu
. Introduction to botany. Botany. 72 Introduction to Botany. EUPHORBIACE^. Spurge Family. ,*=â¬* Herbs, sometimes shrubs or trees, with millcy secretions. Flowers monoecious or dioecious. Flowers mostly apetalous, and sometimes much reduced and subtended by an involucre, which resembles a calyx. Stamens few to many, filaments some- times united. Ovary usually 3-celled, with 1-2 ovules in each cavity. Fruit usually a 3-lobed capsule, dehiscing elastically when mature. (Fig. 349.) I. EUPHORBIA. Spurge. (Named for Euphorbus, physician to King Juba.) Flowers without a calyx and clus- tered in a cup-shaped, calyxlike invo- lucre, the cluster easily mistaken by the beginner for a single flower. The flowers of two kinds within the invo- lucre, many staminate flowers consist- ing of a single stamen, and a single pistillate flower consisting of a single 3-lobed pistil protruding above the staminate flowers. Styles 3 and stig- mas DiHgrams of the inflorescence of a Euphorbia, i, a single inflores- cence with petal-like involucre and protruding pistillate flower. -2., a staminate flower and accompany- ing bract, which is supposed to rep- resent the calyx. 3, longitudinal diagram of an inflorescence, show- ing the pistillate and four stami- nate flowers. 4, cross diagram of an inflorescence, showing the ovary of the single pistillate flower surrounded by staminate flowers. Around all there is the involucre. I. Euphorbia serpens, H. B. K. (L., ser- pens, creeping.) ROUND-LEAVED SPREAD- ING Spurge. Annuals, branching from the base, the branches prostrate, slender, 2 to 12 inches long. Leaves orbicular, ovate, or oval, often less than \ inch long, less than twice as long as broad. Stipules triangular and mem- branaceous. In open places. â i. Euphorbia coroUata, L. (L., cora/Za, a little crown.) Flowering SPURGE. Perennials from stout rootstocks, i to 3 fret tall, unibeliately branched above. Leaves ovate, lanceolate, or linear, only tlie uppermost opposite or \\'horled. Inv
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