TUKNKRACEJi. (TUKNEKA FAMILY.) 167 



indefinite, in several parcels, inserted with the petals. Styles united. 

 Capsule irregularly dehiscent. Seeds few or many, borne on o - 5 

 parietal placentae, commonly with scanty albumen. 



1. MENTZELIA, Plum. 



Calyx tube cylindrical or club-shaped. Petals convolute in the bud. 

 Stamens commonly 30 or more, the exterior ones often dilated and sterile. 

 Styles 3, united to the middle. Capsule 3-valved at the summit, with 3 

 parietal placentas. Cotyledons broad and flat. Stems branching. Leaves 

 toothed or siuuate-pinnatitid. Flowers yellow. 



1. M. Floridana, Nutt. Leaves deltoid-ovate, toothed, truncate and 2- 

 lobed at the base; stamens about 30; capsule 6-seeded. South Florida. 

 Stem trailing, 2- 6 long. Flowers small, golden-yellow. 



OKDEK 02. TUKNEKACE^E. (TUKXEKA FAMILY.) 



Herbs or shrubs, with alternate simple exstipulate leaves, and soli- 

 tary axillary flowers. Calyx free from the 1-celled ovary, colored, 

 5-lobed, deciduous. Petals 5, inserted on the throat of the calyx, con 

 volute in the bud. Stamens 5, inserted on the tube of the calyx be- 

 low the petals. Styles 3, distinct, simple, 2-cleft or 2-parted. Stigmas 

 3 or 6, many-parted. Placentae 3, parietal. Capsule loculicidally 3- 

 valvecl, many-seeded. Seeds anatropous, arilled. Embryo in fleshy 

 albumen. Flowers sessile, or on bracted or jointed pedicels. 



1. PIRIQUETA, Aublet. 



Calyx campannlate. Styles 3, 2-cleft or deeply 2-parted. Stigmas 6, 

 many-parted. Capsule opening to the base into 3 valves. Herbs with stel- 

 late pubescence. Flowers on jointed pedicels, yellow. 



1. P. Caroliniana. Hirsute with fulvous hairs, and stellate-tomentose ; 

 stem simple or sparingly branched ; leaves lanceolate, obtuse, mostly serrate 

 or toothed, nearly sessile ; pedicels (nt least the upper ones) longer than the 

 leaves, often bibracteolate ; petals obovate ; styles 2-parted. (Turnera cis- 

 toides, Ell.) Dry light soil, Florida to North Carolina. June -July. 11 

 Stem 1 high. Leaves 2' -3' long, the lowest ones broader. 



2. P. tomentosa, HBK. Stellate-tomentose throughout ; stem simple; 

 leaves nearly sessile, oblong, acute or obtuse, obscurely crenate, hoary beneath ; 

 pedicels shorter than the leaves. South Florida. Stem 1 high. Leaves 

 rather rigid, 1' long. 



3. P. glabra, Chapm. Stem slender, branching, smooth ; leaves smooth, 

 linenr. entire, the floral ones small and bract-like ; pedicels several times longer 

 than the leaves, and. like the cnlvx. stellate-tomentose ; petals spatulate ; styles 

 2-cleft. (Turnera glabra, DC. 1) South Florida. Stem 1 - 2 high. Leaves 

 '2' long. Flowers 1' in diameter. 



