620 PATAGONIAN EXPEDITIONS I BOTANY. 



b. Fruit with very narrow commissures and 5 primary ribs. Leaves round -peltate or cor- 

 date. I. Hydrocotylc, p. 622. 

 i>2. Fruit with broad commissures, and mericarps dorsally flattened or rounded. 



c. Fruit wingless, with sac-like hollows under the midrib ; ribs often glochidiate-ciliate. 

 Seeds thick, lens-shaped. Herbs with often cordate-palmately divided leaves and 

 stellate-hairs ; the lower leaves opposite, stipulate. 2. Bowlcsia, p. 623. 



c2. Fruit wingless; without sac-like hollows ; transversely oval or circular or rounded- 

 quadrangular. Fruit dry, more or less dorsally compressed, with 3 -dorsal ribs. 

 Calyx-teeth minute, I -nerved. Cespitose, with leaves in rosettes or closely imbri- 

 cate. 3. Azorclla, p. 624. 

 ^3. Fruit broadly and dorsally 4-winged. Mericarps peltate, with small, linear commis- 

 sures. Petals lance-oval. 



d. Calyx not large, its teeth prominent. Petals with midribs inflexed, notched, and 

 dorsal callosity. Glabrous herbs, little branching, with palmately cut leaves. 



4. Asterisdum, p. 632. 



d2. Calyx large, with 5 lanceolate teeth. Petals lanceolate, pointed or slightly 

 notched. Undershrubs of sparing growth, leaves 3-5 -partite, sheathing the 

 branches. 5. Mulinum, p. 633. 



A2. Fruit subglobose, muricate; vittae 5. Leaves palmately 5-3 -partite, the parts tripartite, etc- 



6. Sanicula, p. 635. 



A$. Fruit walls of weak parenchyme ; the fruit nearly ovoid somewhat flattened laterally, oil 

 tubes usually 5, weak or obsolete, flowers in dense head-like umbels, with pointed bracts. 

 Leaves often toothed or lobed, with bristly margins. 7. Eryngium, p. 636. 



A^. Fruit walls consisting of weak parenchyme : sometimes with woody layers. Styles arising 

 from a stylopodium. Oil-tubes arising in the furrows of the young fruit (valleculae), often 

 afterwards specialized. Umbels mostly compound, with a general involucre of bracts, 

 and a special involucel of bracteoles. 

 b. Primary ribs weak or strong, with lateral ribs or with wings. . The valleculas are marked 



only by the oil-tubes. 

 c. Seeds deeply-grooved or hollow on the commissure (by the decay of the raphe). 



d. Crystal -glands in the parenchyme surrounding the carpophore. Flowers polygamous. 

 Fruit ribbed, with very small oil-tubes ; clavate, spurred basewards. Calyx- 

 teeth none. Leaves decompound. Umbels few-rayed ; bracts and bracteoles 

 narrow or none. 8. Osmorrhiza (Washingtonid), p. 637. 



d2. Crystal glands none. Fruit subglobular. 



e. Fruit nut-like, with woody layers ; smooth, showing ribs and oil-tubes only on 

 drying. Commissure flat, not much narrowed. 9. Coriandrnm, p. 638. 



e 2. Fruiting mericarps hanging by small commissures ; externally ovoid-urceolate. 



Chief ribs weak or strong. 



f. Umbels simple, many-flowered. Frond long-ovoid, narrowing upwards. 

 Petals flat, not apically inflexed. Peduncles short and thick. 



10. Orcomyrrltis, p. 638. 

 /2. Umbels compound, many-rayed. Fruit didymous ; commissure broad ; 



ribs wavy. Carpophore short, thick. Style recurved. Petals obcor- 

 date, with strong, reflexed point. Oil-tubes obsolete. 



1 1. Conium, p. 639. 



