166 ONAGRACEAE 



Anthers linear or nearly so, attached near the base; fruit strongly 4-angled, at least 

 above. 

 Pruit sessile, broadly fusiform ; tall biennials. 2. G. neomexicana. 



Fruit prolonged below into a stipe-like base. 



Stipe-like base slender; fruit fusiform; tall herbaceous plant. 3. G. coloradensis. 

 Stipe-like base thick; body of the fruit pyramidal-ovoid; low plants, with sublig- 

 neous base. 

 Plants more or less pubescent. 



Leaves canescent, the lower usually oblong and sinuatcly toothed. 



4. G. coccinea. 

 Leaves sparingly strigose, all linear or nearly so and entire. 



n. G. parvifoUa. 

 Plant glabrous or nearly so, except the strigose hypanthium. 



0. G. glabra. 



22. CIRCAEA L. Enchanter's Nightshade. 



Plant 1-2 dm. high; leaves sharply dentate, usually cordate at the base. 1. C. alvina. 



■ Plant 3-6 dm. high; leaf-blades sinuately denticulate, usually truncate or rounded at 

 the base. 2. C. pacifica. 



Family 92. HALORAGIDACEAE. Water Milfoil Family. 



Flowers monoecious or polygamous, 4-merous; stamens 4 or 8; submerged leaves Qne\y 

 pinnatifid. 1. Myriophyllum. 



Flowers perfect, without sepals and petals; stamen 1 ; leaves all entire. 2. HippuKis. 



1. MYRIOPHYLLUM (Vaill.) L. Water Milfoil. 



Floral leaves ovate, entire or dentate, iisually shorter than the flowers. 



1. Af. spicaivm. 

 Floral leaves pinnatifid, much longer than the flowers. 2. M. verlicillatum. 



2. HIPPURIS L. Mare's-tail. l. H. vulgaris. 



Family 93. AMMIACEAE. Carrot Family. 



A. Fruit with the secondary ribs most pronoinent. in ours ellipsoid, armed with prickles; 



oil-tubes under the secondary ribs; leaves pinnately compoimd. 

 Stylopodium obsolete; calyx-teeth obsolete; fruit flattened dorsally. 



1. Daucus. 

 Stylopodium conical; calyx-teeth prominent; fruit flattened laterally. 



2. Cadcalts. 



B. Fruit with primary ribs only, or ribs wanting; oil-tubes (rarely lacking) in the inter- 



vals between the libs. 



I. Fruit scaly or spiny. 



Fruit ovoid, covered with hyaline scales or tubercles; leaves coriaceous, spinosely 

 toothed or divided; flowers in dense heads. 3. Eeyngium. 



Fruit with hooked spines, subglobose; flowers in simple or compound few-rayed 

 umbels; leaves not spinose, palmately or piimately divided. 



4. Sanicula. 



II. Fruit not spiny, only bristly on the ribs in Osmorrhiza. 



a. Fruit linear, linear-oblanceolate, or linear-lanceolate in outline. 

 Stylopodium present; oil-tubes obsolete in the mature fruit; fruit thickened 



above; leafy-stemmed plants with aromatic thick roots and ternately 



decompound leaves with toothed segments. 

 Fruit attenuate at the base, bristly on the ribs. 5. Osmorrhiza. 



Fruit glabrous, obtuse at the base. 6. Gltcosma. 



Stylopodium wanting; oil-tubes small but evident; fruit thickest below; 

 acaulescent plants, with globose corms and ternate leaves with linear seg- 

 ments. 7. Leibergia. 



b. Fruit oblong to orbicular in outline. 



1. Fruit not compressed dorsaUy, terete In cross-section or somewhat com- 

 pressed laterally; wings of the lateral ribs (if present) rarely much 

 broader than those of the dorsal ribs. 

 "■■ Ribs not conspicuously winged. 



* Ribs at least the dorsal ones filiform or more prominent, but not 

 corky, 

 t Ribs unlike, the dorsal ones filiform, the lateral ones corky and 

 inflexed towards those of the other carpel: commissure with 

 a corky projection which connects the carpels to the gyno- 

 phore, leaving two air spaces between the carpels, this pro- 

 jection, and the lateral wings; plants with corms. 



8. Orogenia. 

 tt Ribs aU nearly aUke; commissure not with corky projection. 

 J Stylopodium conic. 



Leerfy plant with white or pinkish flowers. 



Plants with fascicled tuberous roots and few narrow, 

 mostly entire leaf-segments. 

 Seed-face concave with a longitudinal ridge; oil-tubes 

 several in the intervals. 9. Euixjphtjs. 



