136 AMMIACEAE. 



carpellary or 1-carpellary. Ovary inferior. Fruit drupaceous or baccate, 

 i>r <lry and then a cremocarp. 



FAMILY 1. AMMIACEAE. CARROT FA JULY. 



Herbs with hollow stems. Leaves typically alternate: blades dis- 

 sected, or sometimes merely toothed, or entire. Flowers perfect or polyg- 

 amous, umbellate. Calyx of 5 tooth-like sepals, or obsolete. Corolla of 

 5 petals. Androecium of 5 stamens. Gynoecium of 2 united carpels. 

 often with a stylopodium. Fruit dry, a cremocarp, the ribbed or winged 

 carpels separating at maturity. 



Fruits with obscure or obsolete oil-tubes. 



Involucre wanting: fruits witbout secondary ribs or reticulations. 



i. HYDROCOTYLB. 

 Involucre conspicuous : fruits with secondary ribs and 



reticulations. 2. CEXTELLA. 



Fruits with distinct oil-tubes. 



Inflorescence glomerate, the flowers aggregated Into dense 



heads. 3. EBYXGIIM. 



Inflorescence manifestly umbellate. 



Fruits flattened laterally, the carpels wingless. 4. I'm IMMTM. 



Fruits flattened doreally, the carpels winged. 5. OZTFOLIS. 



1. HYDROCOTYIjE [Tourn.] L. Perennial amphibious herbs. Leaves 

 solitary at each node. Umbels simple or proliferous. Sepals manifest. Petals 

 valvate. Carpels with distinct ribs, and oil-bearing tissues beneath the epi- 

 dermis. MARSH-PENNYWORT. WATER-PENNYWORT. 



Flowers, and fruits very short-pedicel led or sessile, in remote clusters along the 



racbls : fruits rounded or truncate at the base and the apex. i // MrfMMfe 



Flowers, and fruits slender-pxllrt>ll'<l : in terminal umbels: 



fruits notched at the base and the apex. - // uiniiriintn. 



1. H. vcrticillata Thunb. Leaf-blades suborbicular to oval, 1-6 cm. wi.lo, 

 shallowiy crenate: pedicels very short or wanting: fruits 3-4 mm. \\i.l-, \\ith 

 slender ribs. Everglades and shore-hammocks. (Bcr., Bah., Ant.) 



2. H. umbellata L. Leaf-blades suborbicular, 2-5 cm. wide, crenate or crenate- 

 lobed: pedicels slender, 4-12 mm. long: fruits about 3 mm. wide, with corky- 

 thickened ribs. Everglades and low pinelands. (Cuba, Ant.) 



2. CENTELLA L. Perennial amphibious plants. Leaves C!UM. 



the nodes. Umbels capitate. Sepals obsolete. Petals imbricate. Carpels 

 without large oil-tubes, the prominent ribs anastomosing. 



1. C. repanda (Pers.) Small. Leaves clustered; petioles erect, 9-30 cm. long 

 (about 2.5 cm. long, and with larger fruit, in C. repanda jloridana) ; blades 

 thickish, ovate, 2-6 cm. long, repand, cordate or nearly truncate at the base: 

 peduncles usually several together, mostly -h..rt.T than the petioles: umbels 

 2-4-flowered: fruits 4-5 mm. wide. Everglades. (Ber., Bah., Cuba, Ant.) 



3. EBYNGIUM [Tourn.] L. Biennial or perennial herbs. Leaf -blades 

 spiny-toothed, lobed or incised or rarely entire. Bracts of the involucre often 

 colored, otherwise often resembling the leaves. Sepals acute or spine-like. 

 Petals 5, each prolonged into an indexed tip. Carpels with obsolete ribs and 

 5 oil-tubes. ERYNOO. BUTTON-SSAKMOOT. 



Leaf-blades not parallel -veined. 



Basal leaves with entire or toothed blade*. H,il<linii. 



Basal leaves with plnnatlfld or plnnately parted blades. -' / ><nicum. 



Leaf-blades parallel-veined. 8. E. tynchaetum. 



