AMMIACEAE. 



137 



1. E. Baldwinii Spreiis. 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 Inauches 1-G dm. 

 long: blades of the lower leaves spatulate in outline, pinnatilid 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. syiichaetum (A. Gray) Rose. 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. 



i. 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 an<l 

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

 of which is an oil-tube. 



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

 tivelv 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-AVEED. 



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, dorsally 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. filiformis (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, undershrnbs, 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 o, mostly united petals. Androecium of 

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

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

 Fniit capsular, baccate, or drupaceous. 



Ovarv superior: fruit capsular. ,^'''"- o' '^"i^^-^'^^-^^- „ 



Ovary interior: fruits baccate or drupaceous. tarn. 2. v acciniaceab. 



