66 POLYGONACEAE. 



1. T. robusta Small. Plants mainly 6-9 dm. tall, sometimes diffuse: leaf- 

 blades 2-6 cm. long: ocreae copiously fringed: racemes 4-7 cm. long: fila- 

 ments about 4 mm. long: achenes fully 1.5 mm. wide, long- beaked. Pinelands. 



5. PKRSICARIA [Tourn.] Adans. Erect or spreading herbs. Leaves 

 alternate, not jointed at the cylindric naked or fringed ocreae: blades nar- 

 rowed at the base. Flowers borne in spike-like panicles. Sepals white or 

 colored, 5, flat or concave. Stamens 4-8: filaments slender. Stigmas 2, or 

 sometimes 3. Achenes lenticular or 3-angled, included. SMART-WEED. 



Calyx glandular-punctate. 



Ocreae and ocreolae eclltate. 1. P. porioriccnsit. 



Ocreae and ocreolae ciliate. 2. P. pvnrtatn. 



Calyx not punctate. 3. P. hydropiperoidc*. 



1. P. portoricensla (Bertero) Small. Perennial, generally glabrous: leaf- 

 blades lanceolate, usually narrowly so, 3-25 cm. long, acuminate: ocreae very 

 thin: panicles lax: ocreolae eciliate: sepals white or whitish, about 3 mm. 

 long, punctate: achenes turgid-lenticular, 2.5 mm. long. Everglades. (Bah., 

 Cuba, Ant.) 



2. P. punctata (Ell.) Small. Annual or perennial, usually glabrous: leaf- 

 blades lanceolate to oblong-lanceolate, 2-16 cm. long: ocreae long-f ringed : 

 panicles narrow: ocreolae fringed: sepals whitish or green, prominently punc- 

 tate: achenes 3-angled or turgid-lenticular, about 2.5 mm. long, shining. 

 Everglades. (Bcr., Bah., Cuba, Ant.) 



3. P. hydropiperoides (Michx.) Small. Perennial, strigillose in parts: leaf- 

 blades lanceolate, varying to oblong-lanceolate or linear-lanceolate. 4-13 cm. 

 long: ocreae long-fringed, sparingly strigillose: panicles slender, erect, ocreolae 

 short- fringed: sepals deep-pink or greenish, not punctate: achenes 3-angled, 

 2-2.5 mm. long, shining. Hammocks. (Bah.) 



6. COCCOLOBIS P. Br. Shrubs or trees, or rarely vines. Leaves alter- 

 nate, the ocreae cylindric or funnelform. Spikes or racemes elongate. Sepals 

 5, surmounting the accrescent hypanthium. Stamens 8. Stigmas 3, entiro. 

 Achene 3-angled, included in the hypanthium. 



Leaf-blades longer than wide, narrowed at the base: fruits about 1 cm. thick. 



1 r InurifnHa. 

 Leaf-blades wider tban long, cordate at tbe base : fruits 1.5-2 cm. 



thick. 2. C. urifrra. 



1. O. laurifolia Jacq. Tree: leaf-blades oblong to ovate or obovate, 5-10 cm. 

 long, narrowed or rounded at the bare: panicles less than 1 dm. long during 

 antht-sis, the lower flower-clusters usually with 3 or 4 pedicels: sepals 2.5-3.5 

 mm. long: fruit globose-ovoid. Hammocks. F. K. (Bah.. Cuba, Ant.) 



PlOEON-PLUM. 



2. O. uvlfera (L.) Jacq. Shrub or small tree: leaf -blades suborbicular, 4-20 

 cm. wide, cordate at the base: panicles over 1 dm. long in anthesis, dense: 

 sepals 2-3 mm. long: fruit subglobose, borne in grape-like clusters. Coastal 

 sand-dunes. F. K. (Bcr., Bah., Cuba, Ant.) SEA-ORAPK. 



Order CHENOPODIALES. 



Herbs, often partially woody, or shrubs, or trees. Leaves alt-ni:iir 

 or opposite, occasionally scale-like. Flowers mostly perfect, sometimes 

 monoecious or dioecious. Calyx usually present, tbe sepals mainly sepa- 

 rate. Corolla wanting, or present and of minute or large petals. Androe- 

 cium of 1-several stamens. Gynoecium of a single carpel or of several 



