232 



NATURAL HISTORY OF PLANTS. 



137. Heldreichia Boiss. 1 — Sepals equal at base. Larger stamens 

 alate dilated at base or possessing a tooth. Siliqua 2-dymous or 

 obovate, sometimes transversely oblong, compressed • style short ; apex 

 frequently emarginate ; valves acutely keeled ; septum narrow linear 

 thin. Seeds descending strongly compressed immarginate ; coty- 

 ledons accumbent. — Herbs, sometimes sufFrutescent at base, often 

 dichotomously branching ; 2 leaves subradical petiolate ovate, cordate 

 or pinnatisect ; flowers 3 in elongated or short corymbiform, sometimes 

 subumbelliform, ebracteate racemes (East*). 



138. Megacarpsea DC. 5 — Sepals equal. Stamens 6, or more 

 rarely oo, free toothless. Siliqua large, 2-dymous, much laterally 

 compressed ; valves orbiculate, broadly alate, closed ; stigma sub- 

 sessile. Seeds solitary in each cell, large much compressed immargin- 

 ate ; radicle of much compressed embryo accumbent, obliquely 

 descending or transversely superior. — Perennial large robust branch- 

 ing herbs ; root thick long-conical ; leaves (glaucous) pinnatisect ; 

 flowers 6 in simple or branching corymbiform racemes (Himalaya, 

 Tibet, Siberia 7 ). 



139. Cremolobus DC. 8 — Flowers nearly of Biscutella. Siliqua 

 stipitate, 2-dymous, 2 -scutate, dehiscent ; valves (nearly of Biscutella) 

 compressed-keeled or winged at base, narrow closed ; stipe free 

 hardened, more or less thickened at base. Seeds descending immar- 

 ginate. — Herbs or undershrubs erect or subscandent (?), glabrous or 

 pubescent ; leaves opposite or alternate, entire or pinnatifid ; flowers 9 

 ebracteate, in terminal, usually branching racemes (Columbia, Andine 

 Peru 10 ). 



140. Didymophysa Boiss." — Sepals equal at base, suberect. 



1 In Ann. Sc. Nat., ser. 2, xvi. 381.— B. H., 

 Gen., 91, n. 113. — Zygopeltis Fenzl., Enum. PI. 

 Syr. ined. (ex Endl , Gen., Suppl., iii. 87). 



~ With aspect of several Umbelliferce, e.g., 

 of Hydrocotylece. 



3 White or pink, small. 



4 Spec. 4. Boiss., in Tchihatch. As. Min., 

 Rot., i. 327 ; FL Or., i. 319.— Russegg., Eeis., 

 t. 15. — Hook. f. & Thohs., in Joum. Linn. Soc, 

 v. 176. — Walp., Rep., i. 158; Ann., vii. 165. 



5 Syst. Peg., ii. 417 ; Prodr., i. 183.— Endl., 

 Gen., n. 4891. — Hook. f. in Joum. Linn. Soc, 

 v. 176.— B. H., Gen., 91, n. 114. 



6 White or violet. 



7 Spec. 3. Ledeb., Ic. FL Ross., t. 372, 

 380. — Hook., Joum., vii. t. 7. — Walp., Ann. 

 iv. 207. 



8 Syst. Peg., ii. 418 ; Prodr., i. 184. — Endl., 

 Gen., n. 4892.— B. H., Gen., 90, n. 110. 



9 White or yellow. 



10 Spec, about 5. Hook., Icon., t. 32, 81, 99, 

 100.— Walp., Rep., i. 148 ; Ann., vii. 163. 



11 In Ann. Sc. Nat., ser. 2, xvii. 179.— B. II., 

 Gen.. 91, u. 111. 



