An illustrated flora of the An illustrated flora of the northern United States, Canada and the British possessions : from Newfoundland to the parallel of the southern boundary of Virginia and from the Atlantic Ocean westward to the 102nd meridian ed2illustratedflo02brit Year: 1913 SPURGE FAMILY. 471 16. TITHYMALUS [Tourn.] Adans. Fam. 2: 355. -63. Annual or perennial herbs or shrubby plants, with simple or branched stems, which are topped by several-rayed umbel-like cymes. Leaves below the umbel usually scattered or alternate, witliout stipules, often broadened upward. Bracts of the umbel qui
An illustrated flora of the An illustrated flora of the northern United States, Canada and the British possessions : from Newfoundland to the parallel of the southern boundary of Virginia and from the Atlantic Ocean westward to the 102nd meridian ed2illustratedflo02brit Year: 1913 SPURGE FAMILY. 471 16. TITHYMALUS [Tourn.] Adans. Fam. 2: 355. -63. Annual or perennial herbs or shrubby plants, with simple or branched stems, which are topped by several-rayed umbel-like cymes. Leaves below the umbel usually scattered or alternate, witliout stipules, often broadened upward. Bracts of the umbel quite different from the stem-leaves; blades entire or toothed. Involucres sessile or peduncled, a.\illary, disposed in open or close cymes; lobes often toothed. Glands 4, transversely oblong, reni- form or crescent-shaped by the horn-like appendages, the missing one represented by a thin often ciliate lobe. Capsule , smooth or tuberculate; lobes rounded, sharp or keeled. Seeds variously pitted, often with caruncles. [Greek, referring to the milky juice of these plants.] About 250 species of wide geographic distribution. Besides the following, several western North America. Type species: Euphorbia dendroides L. ther Leaves mainly opposite and decussate; capsules 5' wide or more. 1. T. Lalhyrus. Leaves alternate or scattered ; capsules less than 5' wide. Leaves serrulate ; glands of the involucre oblong, oval or orbicular. Seeds smooth or faintly reticulated. Glands stalked ; warts on the capsules elongated; seeds faintly reticulated. 2. T. obtusatus. Glands sessile ; warts on the capsules depressed ; seeds smooth. 3. T. platyphyllus. Seeds strongly and prominently reticulated. Glands nearly sessile ; capsules warty. Upper stem-leaves with small basal lobes ; bracts of the umbel about as broad as loni Upper stem-leaves merely sessile ; bracts of the umbel manifestly longer than broad. S. Glands stalked ; capsules smooth. - 6. T. Helioscopia. Leaves entire ;
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