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Glabrous or hairy, erect annual. Stems up to c. 1 m high, branched or not at base. Lvs alternate, exstipulate, sessile, finely serrate, obovate to oblong-lanceolate, acute, cordate at base, 10-40-(60) mm long. Terminal umbel usually 5-rayed, with usually few to several axillary rays arising below; lvs subtending rays similar to stem lvs; rays secondarily branched and then forming compound dichasia; lvs subtending ray-branches and cyathia all deltate. Glands suborbicular, entire. Capsule shallowly grooved, with conspicuous tubercules. Seeds smooth, rounded, slightly flattened, usually olive-brown, 1.8-2.2 mm long.
Annual, 3–7 dm, commonly with many branches below the umbel; cauline lvs oblanceolate, 2–5 cm, mostly acute, finely serrulate, sessile or nearly so, tapering to a narrow or subcordate base, often sparsely villous beneath; lvs subtending the umbel shorter and broader, those of the umbel depressed-ovate to subrotund; rays of the primary umbel commonly 5; involucres 1.5 mm, almost always finely villous; styles united at base, each branch bifid a fifth its length; fr 3 mm; 2n=28. Native of Europe; intr. in waste places here and there in our range. June–Sept. (Tithymalus p.; Galarhoeus p.)
