Genus 50. 



CARROT FAMILY. 



659 



I. Carum Carui L. Caraway. Car- 

 vies. Fig. 3177. 



Carum Carui L. Sp. PI. 263. 1753. 



Biennial or sometimes perennial, erect, 

 branching, i-2 high. Lower and basal 

 leaves long-pctioled, the uppermost nearly 

 sessile, all pinnatisected into linear or fili- 

 form segments; bases of the petioles widely 

 dilated ; involucre of 1-3 linear bracts, or 

 none ; involucels commonly none ; umbels 

 l'-2i' broad, 7-10-rayed ; rays i'-2' long in 

 fruit; fruit oblong, usually slightly curved, 

 about 2" long, the ribs conspicuous when 

 mature; flowers white. 



Occasional in waste places. Newfoundland to 

 South Dakota, Pennsylvania and Colorado. 

 Adventive from Europe. May-July. 



51. HARPERELLA Rose, Troc. Biol. Soc. Wash. 19: 96. 1906. 



Glabrous aquatic perennials. Leaves reduced to slender, terete, jointed phyllodes. Invo- 

 lucre and involucels inconspicuous. Flowers white. Calyx-teeth small, persistent. Fruit 

 flattened laterally, rounded at both ends, glabrous; carpels hardly flattened, terete, or some- 

 what angled in section ; ribs rather prominent for the size of fruit, equal ; stylopodium conic ; 

 styles slender. Oil-tubes solitary in the intervals, two on the commissural side. Seeds 

 nearly terete in section. [Named for Roland M. Harper, a diligent student and collector.] 



Three known species, natives of the southeastern United States. Type species : Harperella 

 nodosa Rose. 



I. Harperella vivipara Rose. Viviparous 

 Harperella. Fig. 3178. 



Harttcrclla vivipara Rose, Contr. U. S. Nat. Herb. 12 : 290. 

 1911. 



Annual (?), stem slender, weak, at first erect, after- 

 wards somewhat spreading, 4'-8' long, usually simple, 

 sometimes with one or two branches, in age bearing 

 bulblets at the axils of all the leaves. Basal leaves 2 

 or 3, 2"-4" long, terete, jointed, bright green, glabrous, 

 hollow, with a scarious stipular sheath at base ; stem- 

 leaves similar but shorter, alternate, shorter than the 

 internodes ; inflorescence a terminal umbel, with or 

 without other axillary ones; peduncle i'-iV long; rays 

 ij"-S" long; involucre, if present, consisting of one 

 small bract ; bractlets of the involucels 4, minute ; fruit 

 about i" long, broader than long. 



Banks of the Potomac River, Maryland. July-Oct. 



52. CELERI Adans. Fam. PI. 2: 498. 1753. 



Perennial glabrous herbs, with pinnate or pinnately compound leaves, and white or green- 

 ish flowers in compound umbels. Involucre and involucels small or none. Calyx-teeth 

 obsolete. Petals ovate, mostly inflexed at the apex. Stylopodium depressed, or short-conic. 

 Fruit ovate, or broader than long, smooth. Carpels mostly with prominent ribs, somewhat 

 5-angled ; oil-tubes mostly solitary in the intervals, 2 on the commissural side. Seed terete, 

 or nearly so. [The common name.] 



Four or five species, natives of the Old World, southern South America and Australasia, the 

 following typical. 



