Explanation of Pl. XIII. 



Aristolochia Shitnadai Hayata. 



Fig. 1. The i^laiit. 



2. Aj)ical portion of a flower, before opening. 



3. A niature tiower, in vertical section. 



4. Stameus aud style. 



5. A fruit. 



6. 7. Seeds, seen from difterent sides. 

 8. Sectiou of a seed. 



