ZYGOPHYLLACEAE 121 



Pedicels deflexed or reflexed in fruit. 



Stipules conspicuous. 2. 0. corniculata. 



Stipules inconspicuous. 3. 0. stricla. 



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, 1 / -12 / 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. S'-?' high, strigose, branching and spreading from 

 near the base : umbels few-flowered : capsules S^-IS" long. Abundant 

 in waste places. April-September. 



4. O. cymosa Small. KX-24 7 high, villous, usually erect : flowers in 

 many-flowered dichotomous cymes : capsules 3 // -7 // 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 monadelphous 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 x/ -4 /x long. Abundantly adveutized 

 along roadsides and railways. May-September. 



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

 glandular-ciliate : flowers 6". broad : capsules I/'-l^" 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 9"-15" broad : capsules 2"-2$" long. Well estab- 

 lished locally along railroads north of Sheffield. 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. & G. CALLTROP. Pubescent annual, spread- 



