TRELEASE N. AM. RHAMNACE^. 3OI 



Tribe II. Rhamne.e. — Lobes of calyx deciduous (except in Sageretia 

 and one species of Colubrina), the mostly shallow tube lined by the 

 disk, or both adhererent to the lower half of the ovary; fruit drupa- 

 ceous or dry, enclosing 2 to 4 nutlets or cocci. 



* Fruit flcsliy, free from the calyx. 



7. Rhamnus. — Tube of calyx rather deep; petals small and clawless, 

 sometimes wanting; style notched; cocci sometimes perforate at base; 

 usually tardily dehiscent. 



S. .Sageretia. — Calyx shallow; petals cucullate and clawed; style 

 short, 3-lobed. 



* * Fruit dry or nearly so, partly inferior. 



9. Ceaxothus. — Calyx-lobes petaloid ; petals cucullate and clawed; 

 style elongated, mostly 3-lobed with spreading divisions ; inflorescence 

 usually compound and thyrsoid. 



10. Colubrixa. — Chiefly differing from Ceanothtis in habit and the 

 collection of its less showy flowers in axillary umbel-like clusters. 



Tribe III. Colletie.e. — Nearly leafless green-stemmed plants; lobes 

 of calyx persistent; disk lining the cup-shaped calyx tube, mostly 

 investing, but free from, the lower half of the ovary; fruit dry, en- 

 closing 3 cocci. 



11. Adolphia. — Petals cucullate; cocci perforate at base, dehiscent. 



Tribe IV. Gouanie.^. — Lobes of calyx persistent, its tube adherent to 

 the entire surface of the ovary; fruit dry, 3-winged. 



12. Gouania. — Petals cucullate ; fruit separating through the wings 

 into 3 indehiscent, 2-winged segments. 



COXDALIA, Cav. — Rigidly branching, mostly spiny shrubs or small 

 trees, with alternate or obliquely opposite pinnately veined leaves, and 

 small flowers solitary or clustered in the axils. — Ann. Hist. Nat. i. 39;* 

 Gray. Gen. ii. 171 ; Benth. 6: Hook. Gen. i. 376. — About 6 species, of the 

 warmer parts of America. 



* Spinose; leaves alternate, rather small ; flowers solitary, or fascicled without a common 

 peduncle; sepals not conspicuously crested, at most tardily deciduous. 



I. C. obovata, Hook. — Small tree, velvety-pubescent or at length gla- 

 brate, the somewhat angled twigs with white flaking epidermis ; leaves 

 often fascicled, half or three-fourths inch long, petioled, spatulate to 



* The first three volumes of this publication (Madrid) bear the title "Annales de Histo- 

 ria Natural," subsequently changed to "Ann. Ciencias Nat," as quoted by Bentham and 

 Hooker. The copy at the South Kensing^ton branch of the British Museum, which is the 

 only one I have seen, bears date 1599-1S00; but the title page of part t is dated 1799 with 

 the additional imprint 1S29, while part 2 is dated, and with imprint, 1799. 



