314 



AMMIACEAE. 



Waste places, New Providence at Grant's Town : — ^Bermuda ; New Jersey and 

 Pennsylvania to Florida, Texas and California ; locally in the West Indies and in 

 continental tropical America. Native of tlie Old World. Fennel. 



5. HELOSOIABIUM Koch, Nov. Act. Nat. Cur. 12»: 125. 1824. 



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 inhabiting 

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

 Helosciadium nodiflorum (L.) Eoch. 



1. Helosciadium Ammi (L.) Britton, PI. Bermuda 279. 1918. 



Sison Ammi L. Sp. PI. 252. 1753. 



Apium Ammi Urban in Mart. Fl. Bras. 11': 341. 1879. 



Slender, glabrous, much-branched, 0.7-6 dm. high. Leaves ternately pin- 

 natisected, the ultimate segments narrow, often incised; umbels 1-4 cm. broad, 

 opposite the leaves, sessile, the umbellets filiform-stalked; fruit ovate, glabrous, 

 about '2 mm. long, the ribs equal and prominent. 



Waste grounds. New Providence, at Grant's Town : — Bermuda ; southern 

 United States ; Cuba ; Hispaniola ; Guadeloupe : Martinique ; Barbadoes ; Jamaica ; 

 Mexico to Paraguay ; Australia. Fine-leaved Maesh Pakslet. 



Series 2. Gamopetalae. 



Petals partly or wholly united, rarely separate or wanting. 



The coherene-e of the petals is sometimes slight or they are .quite 

 separate, as in some Primulaceae, Plumhaginaceae, Asclepiadaeeae, 

 Oleaceae and Cucurbitaeeae. From this condition the coherence 

 varies through all stages to the tubular or funnelform corollas of 

 some Convolvulaeeae, Caprif oliaceae and Carduaceae. 



t Ovary superior. 



Stamens borne on the corolla, as many as its lobes and 

 opposite them, or twice as many, or more. 

 Herbs, shrubs or trees ; ovary 1-celIed. 

 Shrubs or trees ; ovary several-celled. 

 Stamens borne on the corolla, as many as its lobes or 

 fewer, and alternate with- them (in Forestiera of 

 the Oleaceae there is no corolla). 

 Corolla not scarious, nerved. 



Ovaries 2, distinct (except in some Loganiaceae, 

 and in Gentianaceae in which the ovary is 

 compound with 2 cavities or rarely more, or 

 with 1 cavity and 2 placentae) ; flowers regu- 

 lar ; stamens mostly adnate to only the lower 

 part of the corolla ; leaves mostly opposite. 

 Orary 1, compound (2-dIvided in Dichondra; in 

 Boraginaceae and Lamijiceae mostly deeply » 

 4-lobed around the style) ; flowers regular or 

 irregular ; stamens mostly adnate to the middle 

 of the corolla-tube or beyond ; leaves opposite 

 or alternate. 

 Corolla scarious, nerveless. 



tt Ovary inferior. 

 Anthers distinct. 

 Anthers united (except in Ambrosiaceae). 



Order 1. Peimulales. 

 Order 2. Bbenales. 



Order 3. Gextianales. 



Order 4. Polemoniales. 

 Order 5. Plantaginales. 



Order 6. Eubiales. 

 Order 7. Campanulales. 



