Oenothera nuttallii
 
White Evening-Primrose

Upper Leaf Top

Douglas Provincial Park
26-July-2008

bullet

Nuttallii: Answers to key questions in Budd's Flora and Flora of Alberta leading to this species. 
bullet

plants herbaceous; NOT [plants suffrutescent], NOT [plants without brown woody stems]

bullet

plants with leafy stems; NOT [plants lacking leafy stems, leaves forming a rosette]

bullet

plants usually much-branched

bullet

stems taller; NOT [stems 3-10 cm tall]

bullet

stems stout; NOT [stems slender]

bullet

stems white with shreddy bark; NOT [stems green or reddish]

bullet

buds nodding; NOT [buds erect]

bullet

flowers larger; NOT [flowers minute]

bullet

flowers white or pinkish; NOT [flowers yellow]

bullet

stigma deeply 4-cleft

 

bullet

Oenothera: Answers to key questions in Budd's Flora and Flora of Alberta leading to this genus. 
bullet

hypanthium prolonged beyond the ovary

bullet

flower parts in 4ís; NOT [flower parts in 2ís]

bullet

sepals commonly reflexed; NOT [sepals erect]

bullet

petals yellow, white or pink; NOT [petals purplish]

bullet

anthers attached near their middle, usually versatile; NOT [anthers attached near their base, erect]

bullet

ovary 4-loculed; NOT [ovary2-loculed]

bullet

fruit a capsule; NOT [fruit nut-like]

bullet

fruit opening by valves; NOT [fruit indehiscent]

bullet

fruit opening with 4 valves; NOT [capsules opening with 2 valves]

bullet

fruit NOT covered with hooks; NOT [fruit covered with hooked bristles]

bullet

seeds lacking a coma; NOT [seeds with a tuft of hairs (coma) at one end]

bullet

fruit many-seeded; NOT [fruit 1-seeded]

 

bullet

Onagraceae: Answers to key questions in Budd's Flora  leading to this family. 
bullet

herbs; NOT [shrubs or trees]

bullet

plants terrestrial; NOT [plants aquatic; leaves submerged or floating], NOT [mud plants with small axillary flowers]

bullet

plants NOT with colored milky juice

bullet

plants with more than one normal leaf

bullet

leaves without stipules, or having glands; NOT [leaves with stipules]

bullet

plants without large petal-like bracts; NOT [plants with an involucre of 4 petal-like bracts]

bullet

flowers with two floral rings

bullet

parts of flowers in twos or fours; NOT [parts of flowers mostly in fives]

bullet

calyx regular; NOT [calyx irregular, some sepals smaller than others]

bullet

each petal distinct from the others

bullet

stamens 10 or fewer; NOT [stamens usually more than 10]

bullet

styles single; NOT [styles 2 or more]

bullet

ovary inferior; NOT [ovary superior]