278 



AMMIACEAE. 



8. CELERI Adans. 



Annual or perennial glabrous herbs, with pinnate or pinnately compound 

 leaves, and white flowers in compound umbels. Calyx-teeth obsolete. Petals 

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

 Fruit ovate, or broader than long, smooth, or tuberculate. 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. 



1. Celeri graveolens (L.) 

 Britton. CELERY. (Fig. 302.) 

 Glabrous; stem l-3 high. 

 Leaves pinnate; leaf-segments 

 3 or 5, thin, broadly ovate to 

 oval, coarsely toothed and often 

 incised; umbels 3-7-rayed; in- 

 volucre and involucels small, 

 or none ; flowers small, short- 

 pedicelled ; fruit oval, scarcely 

 i" long, the ribs somewhat 

 winged; oil-tubes mostly soli- 

 tary in the intervals and 2 on 

 the commissural side. [Apium 

 graveolens L.] 



Extensively planted along 

 fresh water marshes, now one 

 of the most important crops, 

 ;mcl more or less persistent after 

 cultivation. Native of Europe. 

 Flowers in spring. 



9. HELOSCIADIUM Koch. 



Low herbs, with decompound or dissected leaves, and compound umbels of 

 small white flowers mostly opposite the leaves. Involucre and involucels want- 

 ing in the following species. Calyx-teeth very small or obsolete. Petals entire. 

 Stylopodium depressed. Style short. Fruit ovate or oblong, laterally com- 

 pressed. Carpels with 5 filiform ribs, the oil-tubes solitary in the intervals, 

 2 on the commissural side. [Greek, marsh-parasol, some of the species inhab- 

 iting marshes.] Six species or more, natives of the Old World. Type species 

 Helosciadiiim nodi forum (L.) Koch. 



