AMAEANTHACEAE. 69 



Anthers 2-celled. 

 I e*iv69 filtGrnfite 



Filaments united at the base : ovules 2-8 in a cavity. 1. Celosia. 



Filaments distinct: ovules solitary in each cavity. a„.».x.^„.,c 



Perianth present in all flowers. 2. Amaranthus. 



Perianth wanting in pistillate flowers. 3. fCNipA 



Leaves opposite. ■*• Aciiiranthes. 



Anthers 1-celIed. 



Stlemas capitate, notched or brush-like. 



Filaments united into a short cup at the base. 5. Alteknantheea. 



Filaments united into a long tube : calyx crested and ^ 



often tubercled or spiny at maturity. 0. 1<roelichia. 



Stiemas 2-3. subulate or filiform. _ ^ 



Flowe7-s in head-like spikes, perfect. 7. Pini-oxERus. 



Flowers in panicles, dioecious. '^^ IRESIm-. 



1. CELOSIA L. Herbs or shrubs. Leaves alternate: blades mainly 

 entire. Flowers perfect, spicate: sepals 5, scarious. Filaments partially 

 united. Styles united. Ovules 2-8. Utricle circumscissile. 



1. C. paniculata L. Perennial, glabrous, 1 m. long or more: leaf -blades ovate, 

 deltoid-ovate, or ovate-lanceolate, 1.5-7 cm. long: spikes 1-3 cm long: sepals 

 oblong 3 5-4 mm. long: utricle included: seed about 1 mm. long.— Coastal 

 sand-dunes and shores of Bay Biscayne.— F. K. {Bah., Cula, Ant.) 



2. AMARANTHUS [Tourn.] L. Herbs. Leaves alternate: blades 

 entire. Flowers polygamous, monoecious, or dioecious, densely spicate or 

 clustered, each subtended by mostly 3 bracts. Sepals 2-5. Filaments dis- 

 tinct. Stigmas 2 or 3, distinct. Ovule solitary. Utricle circumscissile, 

 irregularly opening or indehiscent. 



1. A. spinosus L. Stems 2-12 dm. tall, spiny: leaf -blades ovate, rhombic- 

 ovate, or lanceolate, 1.5-8 cm. long: staminate calyx 2-2.7 mm. long: pistil- 

 late calvx 2-2.5 mm. long; sepals broadened upward, abruptly pointed.— Fine- 

 lands and cultivated grounds. Nat. of Trop. Am.— F. K. {Ber., Bah., Cuia, 

 Ant.) — Thorny-amaranth. 



3. ACNIDA L. Herbs, mostly annuals and large. Leaves alternate: 

 blades entire. Flowers dioecious, the spike sometimes interrupted, the stami- 

 nate with 5 sepals and 5 distinct filaments, the pistillate flowers without a 

 perianth. 



1. A. cuspidata Bertero. Stems 1.5-7 m. tall, widely branched: leaf- 

 blades lanceolate to elliptic-lanceolate, 10-30 cm. long: staminate calyx about 

 2 mm. long; sepals oblong to oblong-ovate, mostly obtuse: pistillate calyx 

 1.7-2 mm. long; sepals lanceolate: utricles 1-1.5 mm. long.— Everglades.— 

 F. K. — Water-hemp. 



4. ACHYRANTHES L. Herbs or woody plants. Leaves opposite: 

 blades entire. Flowers perfect, in slender elongate spikes, commonly de- 

 flexed. Sepals 4 or 5, becoming firm. Stamens 5 or rarely fewer. Styles 

 united. 



1. A. aspera L. Plants 6-14 dm. tall, copiously pubescent: leaf-blades 

 elliptic or nearly so, 7-16 cm. long, acuminate: bracts 4-4.5 mm. long, ab- 

 ruptly long-aristate: sepals linear-lanceolate, 6-7 mm. long: utricle about 3 

 mm. long. — llanimocks. Nat. of Trop. Am. — {Cuba, Ant.) 



5. ALTERNANTHERA Forsk. Herbs (ours perennial). Leaves oppo- 

 site: blades entire or nearly so. Flowers perfect, in head-like spikes. Sepals 

 5, unequal. Filaments united at the base. Staminodia sometimes surpassing 

 the anthers. Styles united. 



