132 UMBELLIfEUJE. 



entire, apex straight. Stamens 5. Styles 2, shorter than 

 the stamens. Fruit laterally flattened, orbicular or shield- 

 shaped, the commissure narrow; carpels 5-ribbed, two of the 

 ribs enlarged, often forming a thickened margin. — Lou: and 

 smooth p quf.it ic perennials, with slender sterns, round peltate 

 or kidney-form leaves, and small white /lowers in simple um- 

 bels or clusters, single or proliferous. 



1. H. AMERICANA^ L. American Marsh Penny-wort. 



Smooth and shining; leaves round, kidney-form,, doubly crenate, slightly-lobed ; 

 flowers in sessile umbels, -3 to 5-flowered; fruit orbicular. 



Moist shady places. June. July. Small delicate plant*. with filiform, branching 

 stems 2 to 6 inches lsng. sending out running suckers. Leaves thin. 1 to 2 inches in 

 diameter on petioles 2 to 3 inches long. Flowers greenish-white, small, in very 

 small axillary umbels. 



2. H. r*nunculoides, L. Lobed Marsh Penny-wort. 



Smooth ; lame* round-kidney-form, 3 to 5- nerved, <he lobes crenate : umbels 8 to 

 10-flowered: pilicd* very short; fruit roundish- smooth, scarcely ribbed. 



In water. June, July. Stems weak, 1 to 2 feet lon._'. creeping or floating. Leaves 

 mostly deeply 3-lobei, the middle lobes smaller than the other, 1 to 2 inches in 

 diameter, on petioles 2 to 3 inches long. Flowers white on peduncles shorter than 

 she petioles. 



3. H. INTERRUPTA, Muhl. 



Smooth; stem filiform; leaves peltate, orbicular, crenate, 11-nerved; umbels capi- 

 tate, subsessile, 5 to 8-fiowered; fruit orbicular. 



Wet places: rare. June — Aug. Ste m and root creeping. Leaves almost centrally 

 pf-ltate, Y / 2 t0 1 inch in diameter, on petioles 2 to 3 inches long. Ptdunebtt about as 

 long as the leaves, bearing clusters of a few sessile flowers, interruptedly along 

 its length. Flou::rs small, white, on very short pedicels. Fruit notched at the 

 base. 



4. H. UMBELLATA, L. Umbellate Penny -wort. 



Smooth; stems rooting at the joint; leaves peltate in the middle, orbicular, 

 notched at the base, doubly crenate; umbel many -flowered on an elongated peduncle. 



Ponds and boggy places; rare. June — Aug. Sew creeping or floating, 2 to 4 

 inches long. Leaves on petioles 2 to 4 inches long. % to 1 inch wide. Cmbtls 20 to 

 30-flowered, the upper pedicel often proliferous with 2 or 3 umbels. Flowers email, 

 Fruit notched at the base and apex. 



2. CKAXTZIA. Nuti. 



In honor of Prof. Grants, an Austrian botanist of the ISth century. 



Calyx-teeth indistinct. Petals roundish, entire, obtuse. 

 Fruit roundish; the carpels hollowed on the inner face, 

 5-ribbed, 3 of the ribs on the back, narrow, the lateral ones 

 thickened and spongy. — Small perennial creeping plants, 

 with linear or filiform, entire fleshy leaves, and few flower* 

 on simple involucrate umbels. 



C LINE AT A, Xutt. 

 £ecK*j «uneate-lin<3ar, obtuse, with transrerse reins, shorter than the pednnelei . 



