or ErBIACE^ IK TKOPICAL AFHICA. 255 



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at the other, while iu Crossojyteryx the peltate seeds have cut 

 membranous "wings. Numerous small angular seeds occur in 

 PentaSy Virecta^ and Otomeria^ and in the tribe Hameliese ; they 

 are more usually globose in Mussaendese and Gardeniece, but the 

 exceptions are too frequent for this distinction to be taken alone 

 for a diagnostic character. 



The seeds are convex on the back and concave with a central 



depression on the face in the genera Ixora and Pavetta ; they are 



i* marked on the face with a longitudinal furrow, which is entered 



by the placenta, iu Cojfca. In Psycliotria they are in most cases 

 longitudinally ribbed or furrowed on the back, and they are marked 

 on the ventral face with a diagonally placed depressed cross in 



the genus Mitracarpum. 



A small aril occurs only in the genus Galiniera. 



The testa is more or less fibrous or fibrous-sulcate in the genera 

 Oxijantlnis^ Mitriostigma, Pouclietia^ and PolyspTiceria, 



Albumen is always present in the seeds except in the ease of 

 the genus GueUarda\ it is usually uniform, but is distinctly 

 ruminated in the genera Enterospermim, Galiniem, Polysph(E7na^ 

 • Butidea^ and Grumilea. 



5. Diferences in tie Androecium, 



There is very little variation in tte structure of the audroeciura 

 in EubiacejB ; the typical form of the anthers is oblong or linear, 

 and though a few genera, especially in the tribes Xaucleeae and 

 Spermacoceee, exhibit a more ovate or lanceolate or shortly oblong 

 form, yet as this matter is one that is seen only by degrees, it 

 does not afford good distinguishing characters ; in the tribe Galieae, 

 especially in the genus Galium, however, the anthers are short. 



In the genus Argostemma the anthers are connivent and dehisce 

 by lateral pores at the apex. In Dictyandra the cells of the 

 anthers are divided into small compartments by a few longitudi- 

 nal and by many transverse septa, and are therefore termed 



locellate. 



In several species of Tricalysia the connective is produced 

 beyond the anther- cells into apiculate appendages ; in our species 

 of the genus Gaillonia two of the anthers are subsessile, while the 

 remaining anthers are furnished with short but distinct filaments. 

 In Spermacoce the number of stamens is rarely reduced to 3 or 



even to 2. 



Dim 



The corolla is regular, or very nearly so, in all of our species ; 



