1286 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Lobes of the calyx shorter than the tube. 



Stamens exserted 4. L. exsertum. 



Stamens included. 

 Leaves obovate to broadly elliptic, 5 to 20 mm. wide__5. L. umbellatum. 

 Leaves spatulate-oblanceolate, usually less than 5 mm. wide. 



6. L, gracilipes. 

 Corolla tube 8 mm. long or less, often ampliate above. 



Pedicels strongly compressed, sharply angulate above; calyx lobes very un- 

 equal, glabrous 7. L. carinatvim. 



Pedicels not compressed or sharply angulate; calyx lobes not very unequal 

 or, if so, puberulent. 

 Calyx lobes narrow, lanceolate or subulate, equaling or longer than the 

 tube. 



Leaves glabrous; calyx lobes 1 to 1.5 mm. long 8. L. geniculatum. 



Leaves usually puberulent; calyx lobes mostly 2 to 4 mm. long. 



9. L. richii. 

 Calyx lobes broad, usually deltoid, shorter than the tube. 



Lobes of the corolla longer than the tube 10. L. carolinianum. 



Lobes of the corolla shorter than the tube or rarely equaling it. 



Leaves sparsely short-pilose 11. L. retusum. 



Leaves glabrous or minutely puberulent. 

 Corolla 7 to 10 mm. long. 

 Leaves glabrous. 



Leaves 3 mm. wide or less 12. L. berlandieri. 



Leaves mostly 4 to 7 mm. wide 13. L. torreyi. 



Leaves puberulent 14. L. cedrosense. 



Corolla 4 to 6 mm. long. 

 Tube of the corolla not exceeding the calyx lobes. 



15. L. calif ornicum. 

 Tube of the corolla not exceeding the calyx lobes. 



Corolla lobes spreading or ascending 16. L. barbinodum. 



Corolla lobes recurved 17. L. peninsulare. 



1. Lycium macrodon A. Gray, Proc. Amer. Acad. 6: 46. 1862. 

 Sonora. Type from southern Nevada or California. 



Spiny shrub ; leaves oblong-oblanceolate or elliptic, 1 to 4 cm. long, obtuse 

 or acute, glabrous ; calyx 1 cm. long or less ; corolla pale lilac, about 1.5 cm, 

 long; fruit orange. 



2. Lycium schaflfneri A. Gray ; Hemsl. Biol. Centr. Amer. Bot. 2: 426. 1882. 

 Zacatecas and San Luis PotosI; type from San Luis Potosf. 



Leaves lance-oblong or oblanceolate-oblong, 1.5 to 3.5 cm. long, obtuse or 

 acute, sessile or nearly so; calyx 4 mm. long, glabrous; corolla 1.5 cm. long; 

 fruit about 8 mm. long. 



3. Lycium pubenilum. A. Gray, Proc. Amer. Acad. 6: 46. 1862. 



Western Texas, along the Rio Grande, and doubtless occurring in Mexico. 



Spiny shrub, about a meter high; leaves obovate or oblanceolate-oblong. 

 8 to 15 mm. long, obtuse; calyx lobes spreading or recurved; corolla nearly 

 1.5 cm. long, white, the the lobes deltoid. 



4. Lycium exsertum A. Gray, Proc. Amer. Acad. 20: 305. 1885. 

 Sonora; type from Altar. 



Spiny shrub, 1 to 2 meters high ; leaves spatulate-obovate or elliptic, 1 to 

 3.5 cm. long, acute to rounded at apex, viscid-puberulent ; flowers slender- 

 pedicellate ; calyx about 6 mm. long, viscid-puberulent ; corolla lobes very short, 

 rounded; fruit orange or red. 



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