142 HALORAGEJE. [CALLITRICHE. 



1. C. ver'na, L. ; leaves not dilated at the base, flowers bractcutr, 

 carpels slightly keeled connate for about half their breadth. 



Ponds, ditches and sluggish streams, ascending to 2,200 ft. in the Highlands ; 

 fl. April-Oct. Very variable in size and habit, covered with scattered 

 stellate hairs or scales. Stems 3-12 in., submerged, terete, sparingly 

 branched. Leaves -1 in., submerged linear ; floating rosulate, obovate, 

 notched, 3-nerved. Floicers, male and female often in opposite axils. 

 Bracts white, deciduous, incurved. Filaments very slender. Furrow on tho 

 carpels shallow, not extending to the base of the lobes. DISTKIB. All temp. 

 and cold climates (Arctic). 



Sub-sp. VERNA'LIS, Kuetzing (sp.); fruit sessile, carpals turgid sharply keeled 

 sinus shallow, styles erect or spreading, pollen ellipsoid. C. u<j>>Kt>'<-<t, Sm. 



Sub-sp. 1'i.ATYCAii'f'A, Kinlzhig (sp.); fruit subsessile, carpels flattish sharply 

 keeled sinus dejp, styles at length reflexed persistent, pollen subglobose. 



Sub-sp. HAMTLA'TA, K'etziny (sp.); fruit subsessile, carpels flattish shortly 

 broadly keeled sinus shallow, styles long at length reflexed deciduous, pollen 

 subglobose. 



Sub-sp. I'EDrxcrLATA, DC. (sp.), leaves always linear, fruit peduncled or 

 sessile, carpels flattish shortly sharply keeled sinus shallow, styles long at 

 length reflexed deciduous, pollen subglobose. Flowers earlier. 



2. C. autumna'lis, L. ; leaves dilated at the base, bracts 0, our] ids 

 broadly winged connate at the base only. 



Lakes, rare and local ; Isla and Kincardine to Anglesea ; N. and N.W. Ireland ; 

 fl. June-Cot. .Stem brittle and leaves without stellate hairs. Leaves ^-^ 

 in., all linear, dark green. Fruit much larger than in C. verna.DlST&IB, 

 Europe (Arctic), Siberia, N. America. 



ORDER XXXII. ONAGRA'RIEJE. 



Herbs (rarely shrubs or trees). Leaves opposite or alternate, exstipulalc. 

 Flowers usually axillary, regular. Calyx superior; lobes 2-4, valvatc 

 in bud. Petals 2-4, rarely 0, inserted at the base of the disk, fugacious, 

 twisted in bud. Stamens 1-8, 1-2-seriate, sometimes decimate; anthers 

 oblong. Disk epigynous and coating the calyx-tube. Ovary 4- (rarely 1-6-) 

 celled ; style lilitbrm, stigma entire or 4-lobed ; ovules 1 or more in the 

 inner angle of each cell, pendulous or ascending, anatropous. Fruit a drupe. 

 berry, or capsule. Seeds 1 or more, smooth papillose or hairy, albumen 

 or very scanty ; embryo ovoid, cotyledons plano-convex. DISTKIB. Temp, 

 regions, rarer in tropical ; genera 22 ; species 300. AFFINITIES. Witli 

 Lythracece and Melastornacece, but not strong. PROPERTIES unimportant. 



Petals 4, pink or purple. Stamens 8 1. Epilobium. 



Petals short or 0. Stamens 4 2. Ludwigia. 



Petals 4, yellow. Stamens 8 2*. CEnothera. 



Petals 2, white. Stamens 2 3. Circsea. 



1. EPILO'BIUM, /,. Vui.unv-iii:i:i;. 



Herbs or under-shrubs, stolons creeping. leaves alternate or opposite. 

 Flowers solitary axillary, or in terminal leafy spikes, pink or purple, rairly 

 yellow. Calyx-tube slender ; limb 4-partite, deciduous. Petal* 4, usually 

 2-lobed. Stamens 8, the alternate shorter. Ovary 4-celled; style filiform, 



