ZYGOPHYLLACEAE 121 



Pedicels deflexed or reflexed in fruit. 



Stipules conspicuous. 2. 0. corniculata. 



Stipules inconspicuous. 3. 0. stricta. 



Pedicels spreading in fruit. 4. 0. cymosa. 



1. O. violacea L. A glabrous acaulescent perennial from a scaly 

 bulb : flowers few, umbellate. — Often common on sunny slopes. April- 

 May. 



2. O. corniculata L. Procumbent, appressed-pubescent, V-\2' long : 

 umbels bearing 1-3 flowers, 2^^-6^^ long : pedicels strigillose, reflexed : 

 capsule 5''''-9^^ long. — Frequent in greenhouses. January-December. 



3. O. stricta L. 3''-?'' high, strigose, branching and spreading from 

 near the base : umbels few-flowered : capsules 8'''-15''^ long. — Abundant 

 in waste places. April-September. 



4. O. cymosa Small. 10^-24^ bigh, villous, usually erect : flowers in 

 many-flowered dichotomous cymes : capsules Z"-!" long. — Common in 

 waste grounds. May-September. 



Family 66. LINACEAE Dumort. 

 Herbs with non-stipulate leaves and perfect flowers. Sepals, petals and 

 stamens five each. Stamens monadelphons at base. Styles 2-5. Ovary 

 2-5- or 4-10-celled. Fruit a capsule. 



1. LINUM L. Flax. 

 Flowers paniculately racemose. Ovary 4-5-celled, or falsely 8-10- 

 celled, 8-10-seeded. 



Flowers blue. 1. L. usitatissimum. 

 Flowers yellow. 



l°-2° high ; branching above. 2. L. sulcatum. 



1° or less high ; branching throughout. 3. L. rigidum. 



1. L. usitatissimum L. Annual, l°-2° high : leaves linear-lanceolate : 

 flowers 6^^-8^^ broad : capsule 3'^-4'^ long. — Abundantly adveutized 

 along roadsides and railways. May-September. 



2. L. sulcatum Eiddell. Annual : leaves linear-lanceolate, the upper 

 glandular-ciliate : flowers 6^^ broad : capsules \"-\\" long. — In dry 

 woods and prairies, Dodson to Lee's Summit and southward. Rather rare. 

 June-August. 



3. L. rigidum Pursh. Annual, with rigid branches : leaves linear- 

 lanceolate : flowers 'd"-\h" broad : capsules 2^^-22^^ long. — Well estab- 

 lished locally along railroads north of Sheflield. May. 



Family 67. ZYGOPHYLLACEAE Lindl. 

 Herbs with opposite pinnate leaves and perfect axillary flowers. Petals 

 and sepals five each. Stamens 5-15. Pistils 4-12. Fruit dry. 



1. KALLSTROEMIA Scop. 

 Fruit not prickly, its 10-12 segments each 1-seeded. Flowers yellow. 

 1. K. maxima (L. ) T. AG. Calltrop. Pubescent annual, spread- 



