106 AMMIACEAE. 



spike, nocturnal. Petals yellow. Ovary slender. Capsule narrowly cylindric, 

 or rarely slightly tapering. Seeds tubercled. 



1. E. humifusa (Nutt.) Eose. Branches silky-canescent : blades of the cauline 

 leaves oblanceolate to lanceolate, undulate, repand or toothed: sepals about $ 

 as long as the hypanthium: petals 8-13 cm. long: capsules 3-3.5 mm. in 

 diameter. [Oenothera humifusa Nutt.] Coastal sand-dunes, U. S. keys. 

 [E. K.] (Ber.) EVENING-PRIMROSE. 



3. GAURA L. Annual, biennial, or perennial herbs. Leaf-blades entire, 

 toothed, or pinnatifid. Flowers spicate or racemose. Hypanthium narrow, 

 somewhat prolonged beyond the ovary. Petals unequal, with clawed blades. 

 Stamens 8, declined. Style declined. Stigma 4-lobed, surrounded by a cup- 

 like border. Fruit ribbed or angled. 



1. G. simulans Small. Stems 9-20 dm. tall, loosely pubescent below : blades of 

 the stem-leaves oblanceolate or narrowly spatulate to lanceolate or linear- 

 lanceolate, 2-12 em. long, pinnatifid to sharply toothed: sepals broadly linear, 

 rather obtuse: petals pinkish, 4.5-5 mm. long: fruits, 8-10 mm. long, glabrous. 

 Coastal sand-dunes, U. S. keys. [E. K.]. 



Order AMMIALES. 



Herbs, shrubs, trees, or vines. Leaves alternate or opposite: blades 

 simple or compound. Flowers perfect, polygamous, or dioecious, often 

 borne in umbels. Calyx of typically 5 small petals, surmounting the 

 hypanthium. Corolla typically of 5 petals, or wanting. Androecium of 

 as many stamens as the sepals. Gynoecium 2-carpellary, or rarely several- 

 carpellary or 1-carpellary. Ovary inferior. Fruit drupaceous or baccate, 

 or dry and then a cremocarp. 



FAMILY 1. AMMIACEAE. CARROT FAMILY. 



Herbs with hollow stems. Leaves typically alternate: blades dis- 

 sected, or sometimes merely toothed, or entire. Flowers perfect or polyg- 

 amous, umbellate. Calyx of 5 tooth-like sepals, or obsolete. Corolla of 

 5 petals. Androecium of 5 stamens. Gynoecium of 2 united carpels, 

 often with a stylopodium. Fruit dry, a cremocarp, the ribbed or winged 

 carpels separating at maturity. 



Fruits with narrow-winged lateral ribs ; dorsal ribs narrowly winged : corolla yellow : 

 involucre and involucels wanting. 1. ANETHUJI. 



Fruits with broad-winged lateral ribs ; dorsal ribs merely filiform : 



corolla white : involucre and involucels present. 2. OXYPOLIS. 



1. ANETHUM L. Annual or biennial herbs. Leaves alternate: blades 

 decompound, the segments narrowly linear or linear-filiform. Flowers in naked 

 compound umbels. Hypanthium truncate. Petals yellow. Stylopodium de- 

 pressed. Styles short. Fruit slightly elongate, flattened dorsally : carpels ribbed 

 and with narrow lateral wings. 



1. Anethum graveolens L. Plants 1 m. tall or less, glaucous: leaf -segments 

 numerous : umbels many-flowered, the rays unequal : sepals minute : petals ovate 

 to orbicular, 1 mm. long or less: fruits oblong to oval-oblong, 4.5-5 mm. long, 

 glaucous. Hammocks and cultivated grounds, U. keys. Nat. of Eu. (Bah., 

 Cuba, Ant.) DILL. 



