UYGTAGINACEJE. 19 



3. Okenia Schied. — Flowers nearly of Mirabilis ; subinfundibuli- 

 form limb of perianth, regular, 5-ficl ; lobes emarginate. Stamens 1 5— 

 18. Fruit clothed with hardened suberous base of calyx, 10- 

 costate, closed at apex, finally entering the ground by elongation of 

 peduncle after anthesis. Other characters as in Mirabilis. — A pros- 

 trate herb ; leaves glutinous ; flowers solitary terminal, axillary to 

 branches usually short ; peduncles much elongated after anthesis ; 

 bracts 3, in a short involucre, imbricate under articulate flower 

 (Mexico). See p. 5. 



4. Pentacrophys A. Gray. — Flowers nearly of Okenia ; calyx 

 regular. Stamens 2. Germen of Mirabilis ; style slender, peltate 

 stigmatiferous at apex. Fruit clothed with cylindrical base of calyx, 

 5-costate, truncate at apex ; ribs thick suberous longitudinal, swell- 

 ing to large glands at apex. Other characters as in Mirabilis. — A 

 low herb, lignescent at root, many stemmed, and viscous-pubescent 

 scabrid; leaves opposite petiolate; flowers terminal or lateral to leaves; 

 bracts below articulate flower, 3 subulate (N. Mexico). See p. 5. 



5. Selinocarpus A. Gray.— Flowers nearly of Okenia ; calyx 

 subcyathiform or infundibuliform-tubular 5-agonal. Stamens 2-5 

 exserted. Germen, fruit and seed of Mirabilis ; style of Okenia. 

 Fruit clothed by accrescent base of calyx produced into 3-5 mem- 

 branous-scarious vertical wings. — Low herbs, sometimes suffru- 

 tescent, many-stemmed from tuberous or lignescent root ; flowers 

 terminal or lateral to leaves, 2-nate or many glomerulate ; bracts 

 below flower 1-3 minute (N. Mexico). See p. 5. 



6. Oxybaphus Vahl. — Calyx very shortly tubular at base ; limb 

 4-5-merous, regular or oblique campanulate folded, deciduous. 

 Stamens 3,4, connate at base. Germen of Mirabilis ; style granular- 

 capitate at apex. Fruit ovate costate, seed, embryo, albumen of 

 Mirabilis. — Herbs ; leaves opposite ; flowers in cymes often 1 -parous 

 and lateral ; involucre gamophyllous, 5-fid, I- or 3-flowered (Allio- 

 nqpsis), sometimes 4, 5-flowered, often marcescent after anthesis 

 (Tropical and Subtropical America, Mountainous India). See p. 6. 



7. Allionia L. — Flowers nearly of Oxybcuphus ; regular 4-merous. 



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