Convolvulus.] xc. convolvulace^e (baker and bekdle). 



89 



1. C. sericophyllus. 



2. C. Hystrix. 



3. C. Muspolii. 



4. C. Hildebrandtii. 



C. microphylhis. 

 C. pluricaulis. 

 C. Deserti. 



Species about 150, in the temperate and subtropical regions of both hemispheres; 

 rarer in the tropics. 



:;: Xeeophtt^;. — Small perennial undershrubs with slender branches rising 

 more or less erect from the woody rootstock, or spreading; cauline leaves very small ; 

 flowers not in involucrate heads. 



Branches erect, spinescent at the tip. 



Corolla several times longer than the calyx, 9 lin. 

 long ....... 



Corolla but little longer than the calyx, barely 

 6 lin. long ....... 



Branches bearing short spiny branchlets . 

 Branches not spiny. 



Flowers very laxly arranged on filiform almost 

 leafless shoots ...... 



Flowers 1—3 together, subsessile in the leaf-axils. 

 Cauline leaves less than 6 lin. long 

 Cauline leaves more than 6 lin. long 

 Flowers few on conspicuous pedicels 

 ** Capitate. — Annual or perennial herbs ; stems more or less erect, prostrate or 

 twining ; flowers aggregated in sessile or stalked, involucrate, generally densely 

 liairy heads. 



Heads sessile or shortly stalked. 



Corolla about twice as long as the calyx. 

 Leaves linear-oblong to oval, ^-1 in. long . 

 Leaves subspathulate with cordate or subhastate 

 base, t? in. long ..... 



Leaves oblong or oblanceolate, 1-2 in. long 

 Corolla scarcely exceeding the calyx. 



Seeds puberulous ...... 



Seeds papillose- tuberculate .... 



Heads conspicuously stalked, subtended by a pair of 

 leafy bracts ...... 



*** Aevenses. — Herbaceous, or shrubby below, rarely suffruticose ; stems slender 

 prostrate, or more often twining, at any rate at the ends; flowers solitary in the 

 leaf-axils or in slender-stalked few-flowered cymes ; bracts generally very small. 

 Suffruticose; stems erect, covered with silvery, silky 

 pubescence ....... 



Herbaceous or shrubby ; stems prostrate or climbing, 

 rarely ascending (not silvery). 

 Leaves lanceolate, acute ; flowers minute (corolla 

 3 lin. long) ....... 



Leaves oblong with entire base .... 



Leaves sagittate. 



Sepals crisped ... .... 



Sepals not crisped ...... 



Leaves ovate with small entire basal auricles 

 Leaves ovate with hastate base. 

 Corolla 4 times as long as calyx 

 Corolla scarcely twice as long as calyx 

 Leaves cordate-ovate. 



Stems climbing ; leaves shallowly crenate . 

 Stems diffuse ; leaves deeply crenate . 

 **** Anomaly. — Climber with long-stalked ovate-cordate leaves and large (for 

 the genus) flowers aggregated in bracteate heads on long peduncles. 



Only species ........ 24. C. Kilimandschari. 



8. 



C. littoralis. 



9. 

 10. 



C. subspatJiulatus . 

 C. rhyniospermus. 



11. 



12. 



C. capituliferus. 

 C. hamphilahensis 



13. C. glomeratus. 



14. C. Randii. 



15. 

 16. 



C agrestis. 

 C. angolensis. 



17. 

 18. 

 19. 



C. ulosepalus. 

 C. sagittatus. 

 C. huiilensis. 



20. 

 21. 



C. arvensis. 



C. Sehiveinfiirthii 



22. C.farinosus. 



23. C.fatmensis. 



