CISTACEAE 795 



3. Piriqueta tomentdsa H.B.K. Pubescent with stellate tomentum. Stems erect or 

 decumbent, 2-4 dm. tall, simple or branched, leafy : leaf-blades leathery, oval, oblong or 

 rarely narrowly oblong-lanceolate, 1-4 cm. long, obtuse, slightly crenate-serrate, sessile or 

 short-petioled below : calyx turbinate or campanulate-turbinate ; lobes lanceolate, 5-8 mm. 

 long, acute, slightly spreading : petals yellow, obovate, about 1.5 cm. long : capsules sub- 

 globose, 5-6 mm. in diameter, minutely pubescent : seeds fully 2 mm. long. 



In pine lands, peninsular Florida. 



4. Piriqueta Caroliniana (Walt.) Urban. Pubescent with fulvous hirsute hairs and 

 stellate tomentum. Stems erect, 1-4 dm. tall, simple or sparingly branched : leaf-blades 

 obovate, oblong or cuneate, lanceolate, or rarely oval, 1-7 cm." long, obtuse, repand or 

 crenate-serrate, sessile or with short petioles : pedicels shorter than the peduncles : calyx 

 turbinate ; lobes lanceolate, 8-10 mm. long, acute, slightly spreading : petals yellow, obo- 

 vate, 1.5-2 cm. long : capsules subglobose, 5-7 mm. in diameter, minutely pubescent : 

 seeds fully 2 mm. long. 



In pine lands, North Carolina to Florida and Alabama. 



2. TURNERA L. 



Shrubs or shrubby plants, with glabrous or pubescent foliage. Leaves few, alternate : 

 blades entire, toothed or pinnatifid. Flowers solitary in the axils, or sometimes in clus- 

 ters or racemes, with or without bractlets. Sepals 5, more or less united, imbricated. 

 Petals 5, usually yellow, convolute, inserted at the throat of the calyx-tube. Stamens 5, 

 inserted near the petals. Filaments somewhat flattened, distinct. Anthers 2-celled. 

 Stigmas 3, brush-like. Capsule barely elongated, 3-valved. Seeds curved, with a pitted 

 or rough testa. 



1. Turnera aphrodisiaca Ward. A low diffuse shrub, with strigose foliage, or 

 glabrate. Leaves approximate or clustered on the branchlets ; blades spatulate or oblong- 

 spatulate, leathery, 1-2.5 cm. long, acute, coarsely few-toothed, narrowed into slender 

 petioles, the nerves prominent beneath, impressed above : calyx 4 mm. long, sessile, tubu, 

 lar ; lobes oblong or ovate-oblong, shorter than the tube, tips recurving : petals yellow- 

 6-8 mm. long, narrowly cuneate : capsules ovoid, 4-6 mm. long. 



In dry soil, southern Texas and adjacent Mexico. 



FAMILY 9. BIXACEAE Reichenb. BIXA FAMILY. 



Shrubs or small trees. Leaves alternate : blades simple, toothed, lobed or 

 rarely entire. Flowers perfect, solitary or several to many and variously dis- 

 posed. Calyx of 4-5 usually imbricated sepals. Corolla wanting, or of as many 

 petals as the sepals, deciduous. Androecium of numerous or rarely few stamens. 

 Anthers opening by apical chinks. Gynoecium of 2-several united carpels. 

 Ovary superior, 1-celled, with 2-several parietal placentae which are sometimes 

 well intruded. Styles as many as the placentae, but united. Ovules 2-many on 

 each placenta. Fruit a valvate capsule, the valves bearing the placentae. 

 Seeds numerous, often hairy. 



1. AMOREUXIA Mo? & Sess. 



Branching shrubs. Leaves alternate : blades palmately lobed. Flowers in terminal 

 panicles. Sepals 5, deciduous. Corolla showy. Petals 5. Stamens numerous : anthers 

 narrow. Ovary 2-celled by the meeting of the placentae. Ovules numerous. Capsule 

 loculicidally 3-valved, the valves leathery, separating from the endocarp and scarious 

 partitions. Seeds numerous, smooth, the bony testa surrounded with a membranous coat. 



1. Amoreuxia Wrightii A. Gray. Stems solitary or several from a stout base, 2-5 

 dm. tall : leaf-blades 2.5-5 cm. broad, deeply 5-7-lobed, the lobes mainly obovate, regularly 

 toothed: sepals 1.5-2 cm. long : petals twice as long as the sepals, orange above the brown- 

 ish base : capsules ovoid to oblong-ovoid, mainly 4-5 cm. long : seeds obovoid. 



On dry or stony hills, Texas to Arizona and Central America. Spring to fall. 



FAMILY 10. CISTACEAE Lindl. ROCK-ROSE FAMILY. 



Shrubs or low woody herbs, with erect or spreading stems. Leaves alternate 

 or opposite : blades simple. Flowers regular, generally perfect, solitary, racemose, 



