AMMIACEAE. 137 



1. E. Baldwinii Spreng. Plants prostrate: blades of the basal leaves oblong 

 varying to broadest above or below the middle, 2-9 cm. long: heads ovoid to 

 cylindric: bracts of the involucres subulate. Everglades. 



2. E. aromaticum Baldw. Plants ultimately diffuse, the branches 1-6 dm. 

 long: blades of the lower leaves spatulate in outline, pinnatifid or pinnately 

 parted, 3-4 cm. long, pale-margined: heads becoming 8-10 mm. long: sepals 

 lanceolate, 2-2.3 mm. long, acuminate: petals fully 1.5 mm. long: fruits 

 granular, 1.5-2 mm. long, or rarely smaller. Pinelands. 



3. E. synchaetum (A. Gray) Eose. Plants 3-9 dm. tall: blades of the lower 

 leaves narrowly linear, usually pliable: sepals broadly ovate to deltoid-ovate, 

 1.5-1.8 mm. long: petals less than 2 mm. long: fruits 2-2.5 mm. long. 

 Pinelands. 



4. PTILIMNIUM Eaf. Annual herbs. Leaf -blades pinnately or ternately 

 dissected, the segments very narrow. Umbels compound. Involucres and in- 

 volucels of slender, often dissected, bracts and bractlets. Sepals obsolete. 

 Petals white. Fruit slightly longer than wide: carpels with the dorsal and 

 contiguous ribs prominent and the lateral ones thick and corky, between each 

 of which is an oil-tube. 



1. P. capillaceum (Michx.) Hollick. Plants 2-8 dm. tall: leaf-segments rela- 

 tively few and lax: umbel-rays few to several, less than 2.5 cm. long at 

 maturity: bracts lobed: petals less than 1 mm. long: stylopodium didymous in 

 anthesis: fruits ovoid, about 2 mm. long, acute. Hammocks and everglades. 

 BISHOP 'S-WEED. 



5. OXYPOLIS Eaf. Perennial herbs. Leaf-blades pinnate or ternate, or 

 rarely reduced to hollow septate phyllodia. Umbels compound. Sepals acute. 

 Petals white. Fruit longer than broad, dor sally flattened: carpels with the 

 dorsal and contiguous ribs thin, and winged lateral ribs, the latter nerved near 

 the inner part of the wing: oil-tubes solitary in the intervals and 2-6 in the 

 inner face. 



1. O. filifonnis (Walt.) Britton. Plants 5-18 dm. tall: phyllodia 3-60 cm. 

 long: fruits oblong-oval or oval-obovate, 5-6 cm. long, broadly winged. 

 Everglades. F. K. 



Series 2. GAMOPETALAE. 



Petals more or less united, or occasionally distinct, or very rarely 

 wanting. 



Order ERICALES. 



Herbs, undershrubs, shrubs, or trees, sometimes humus-plants or 

 saprophytes. Leaves alternate, often evergreen: blades simple. Flowers 

 mainly perfect and complete. Calyx of 2-8, usually 5 partially united 

 sepals. Corolla of 2-8, usually 5, mostly united petals. Androecium of 

 as many or twice as many stamens as petals, sometimes partially reduced 

 to staminodia : filaments mostly free. Gynoecium of several united carpels. 

 Fruit capsular, baccate, or drupaceous. 



Ovary superior : fruit cnpsulnr. Fam. 1. ERICACEAE. 



Ovary inferior : fruits baccate or drupaceous. Fam. 2. VACCINIACKAB. 



