ZYGOPHYLLACEAE 121 



Pedicels deflexed or reflexed in fruit. 



Sfjipnles conspiouous. 2. 0. eornieulaia. 



Stipules inoonspiouons. 3. 0. strieta. 



Pedicels spreading in fruit. 4. O. cymosa. 



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

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

 May. 



2. O. cornicnlata L. Procumbent, appressed-pubescent, I'-IS' long : 

 umbels bearing 1-3 flowers, S^'-e" long : pedicels strigilloae, reflexed : 

 capsule f/'-W long. — Frequent in greenhouses. January-December. 



3. O. sttlcta L. S'-T' 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. l(K-24' high, villous, usually erect : flowers in 

 many-flowered diohotomous cymes : capsules W-V long. — Common in 

 waste grounds. May-September. 



Family 66. LINACEAE Dumort. 

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

 stamens five each. Stamens monadelphous at base. Styles 2-5. Ovajy 

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



1. LINUM L. Flax. 

 Flowers panioulately 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. Ii. usitatissimum L. Annual, l°-2° high : leaves linear-lanceolate : 

 flowers Q"-Q" broad : capsule Z"-V long. — Abundantly adveutized 

 along roadsides and railways. May-September. 



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

 glandular-ciliate : flowers W broad : capsules \"-\Y' long. — In dry 

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

 June-August. 



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

 lanceolate : flowers W-\?/' 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. TTi a-irim a (L.) T. & G. Callteop. Pubesccut annual, spread- 



