Calyx-teeth obsolete. Fruit linear to linear-oblong, with prominent caudate attenuation at base, very bristly, with equal ribs; oil-tubes obsolete; seed-face concave.--Glabrous to hirsute perennials (1--3° high) from thick aromatic roots, with ternately compound leaves, ovate variously toothed leaflets, few-leaved involucres and involucels, and white flowers in few-rayed and few-fruited umbels. (Name from ὀσμή, _a scent_, and ῥίζα, _a root_.) 1. O. brevístylis, DC. Rather stout, _villous-pubescent_; leaves 2--3-ternate; leaflets 2--3´ long, acuminate; fruit (not including the caudate attenuation) 6´´ long; _stylopodium and style ½´´ long_.--From N. Scotia westward through the Northern States, and in the mountains to N. C. May, June. 2. O. longístylis, DC. _Glabrous or slightly pubescent_; like the last, but with the _style 1´´ long or more_, and the seed-face more deeply and broadly concave.--N. Scotia to Va., and west to Tenn., E. Kan., and Dak. 33. ERIGÈNIA, Nutt. HARBINGER-OF-SPRING. Calyx-teeth obsolete. Petals obovate or spatulate, flat, entire. Fruit didymous, nearly orbicular and laterally flattened, the carpels incurved at top and bottom, nearly kidney-form, with 5 very slender ribs, and several (1--3) small oil-tubes in the intervals; inner face of the seed hollowed into a broad deep cavity.--A small glabrous vernal plant, producing from a deep round tuber a simple stem, bearing one or two 2--3-ternately divided leaves, and a somewhat imperfect and leafy-bracted compound umbel. Flowers few, white. (Name from ἠριγένεια, _born in the spring_.) 1. E. bulbòsa, Nutt. Stem 3--9´ high; leaf-segments linear-oblong; fruit 1´´ long, 1½´´ broad.--W. New York to Md. and Tenn., and west to Wisc., S. E. Minn., and Kan. 34. HYDROCÓTYLE, Tourn. WATER PENNYWORT. Calyx-teeth obsolete. Fruit strongly flattened laterally, orbicular or shield-shaped; the carpels 5-ribbed, two of the ribs enlarged and often forming a thickened margin; oil-tubes none, but usually a conspicuous oil-bearing layer beneath the epidermis.--Low, mostly smooth, marsh or aquatic perennials, with slender creeping stems, and round shield-shaped or kidney-form leaves, with scale-like stipules. Flowers small, white, in simple umbels or clusters, which are either single or proliferous (one above another), appearing all summer. (Name from ὕδωρ, _water_, and κοτύλη, _a flat cup_, the peltate leaves of several species being somewhat cup-shaped.) [*] _Pericarp thin except at the broad corky dorsal and lateral ribs; leaves round-peltate, crenate; peduncles as long as the petioles, from creeping rootstocks._ [+] _Fruit notched at base and apex; intermediate ribs corky._ 1. H. umbellàta, L. _Umbels many-flowered, simple_ (sometimes proliferous); _pedicels 2--6´´ long; fruit about 1½´´ broad_, strongly notched, the dorsal ribs prominent but obtuse.--Mass. to Minn., south to the Gulf.