LAKES, RIVERS, DITCHES, ETC. 



101 



scalloped teeth. The divided leaves are few, 

 rigid, not collapsing-, and either floating- or aerial. 

 The submerged leaves with flat segments are 

 seldom produced. The floating leaves are some- 

 what shield-shaped, deeply divided into 3 nearly 

 to the base, the lobes wedge-shaped, inversely 

 egg-shaped, 2-4 fid. The upper stipule is free. 

 The flowers are pinkish - white, the petals little 

 longer than the calyx. The petals may be longer 

 and 5-veined. There are 5-10 stamens. The style 

 soon falls, and is terminal, with a slender base, 

 awl-like. The carpels are unequally inversely 

 egg-shaped, much inflated, with a nearly terminal 

 point. The inner edge is much rounded. The 

 plant is in flower between May and July, and is a 

 herbaceous annual. 



Ivy-leaved Water Buttercup (Ranunculus hede- 

 raceus, L.). The habitat of this plant is shallow 

 ponds, muddy places. The habit is prostrate. 

 The stem may float (rarely) or creep on the mud. 

 The leaves are opposite as a rule, rounded, heart- 

 shaped, or ivy-like ( hence hederaceus), with 3-5 

 shallow, entire, triangular, rounded lobes, widened 

 at the base, and are usually spotted. The flowers 

 are white, the sepals and petals of about the same 

 length. The petals are 3-veined, distant, and 

 narrow. The receptacle is smooth. The stamens 

 are 6-8, as long as the pistil. The achenes are 

 small, few, and blunt. The plant is prostrate. 

 The flowers bloom between May and August. The 

 plant is a herbaceous perennial. 



Celery-leaved Crowfoot (Ranunculus scelera- 

 tus, L.). The habitat of this species is ditches, 

 muddy places, and ponds. The habit is erect. 

 The stems are robust, succulent, hollow. The root 

 is fibrous. There are submerged leaves which 

 are different to the aerial leaves. The radical 

 leaves are stalked, divided into three, with blunt, 

 scalloped lobes, shining, smooth, the upper ones 

 slightly hairy, and linear. The flowers are small, 

 pale-yellow. The calyx is turned back, the sepals 

 hairy. The honey-glands are round, open, bor- 

 dered all round, not above. The achenes are 

 smooth, oblong, numerous, wrinkled, furrowed 

 one side. There is a very small style. The plant 

 is 8-24 in. in height, and flowers between May 

 and September. It is a herbaceous perennial. 



Ranunculus scoticus, Marshall (= R. petiolaris, 

 E. S. Marshall). The habitat of this plant is High- 

 land lakesides. The plant is closely allied to the 

 Lesser Spearwort, resembling it in habit. The 

 stem is smooth, solitary, suberect, zigzag. The 

 stem does not root at the nodes. The young 

 radical leaves are numerous, small, and do not 

 persist, being without any lamina. The later 

 radical and lower stem-leaves are larger, with 

 or without blunt, oblong to lance-shaped laminae. 

 The upper stem-leaves are linear, lance-shaped, 

 blunt, stalkless, or nearly so. The flowers are 

 yellow, the petals inversely ovate, blunt. The 

 carpels are inversely ovate, and pitted. The plant 

 is 4-12 in. in height, flowering from June to 

 August, and is a herbaceous perennial. 



Ranunculus repfans, L. The habitat of this 

 plant is sandy snores of Loch Leven, &c. The 



plant is prostrate in habit. It is very slender, 

 and the stem roots at every arching internode. 

 The leaves are linear, entire. The flowers are 

 very small. The achenes are very small. The 

 style is sub-cylindrical, and bent back. The 

 carpels are bluntly beaked. The plant is 1-4 in. 

 in height, and flowers between June and August. 

 It is a herbaceous perennial. 



ORDER 



Nympha-a, pumila, Hoffm. The habitat of this 

 water-lily is small Scottish lakes. The plant has 

 the water-lily habit, being aquatic, resembling the 

 Yellow Water-lily, from which it differs in the 

 smaller, more-rounded petals, and shorter anthers. 

 The leaves are heart-shaped, oblong, 2-lobed 

 below, the lobes distant, spreading at length. The 

 submerged leaves are thin and transparent, wavy, 

 kidney-shaped. The leaf-stalk is 2-edged. The 

 flowers are small and yellow. There are 5 sepals. 

 The stigma is rayed at the margin, with 8-10 rays, 

 and these form acute teeth. The anthers are 

 oblong, not twice as long as broad. The capsule 

 is furrowed above. The plant is floating. The 

 flowers are in bloom from June to August. The 

 plant is a herbaceous perennial. 



ORDER CRUCIFERJK 



Creeping Yellow Cress (Radicula sylvestris, 

 Druce = ^. pinnata, Moench). The habitat of this 

 plant is moist waste places, watery places. The 

 habit is creeping, then erect. The rootstock is 

 creeping. The stem is wavy and angular. The 

 leaves are divided to the base, each side of a 

 common stalk, with numerous oblong, lance- 

 shaped leaflets, the uppermost leaves sometimes 

 nearly entire. The flowers are in short racemes. 

 They are yellow, with petals twice as long as the 

 calyx. There are six disk-glands. The pods are 

 linear, on spreading stalks, and are spreading or 

 ascending, as long as the stalks or shorter. The 

 seeds are very small, hardly in 2 rows. The plant 

 is 9-18 in. in height, and flowers between June and 

 August. It is a herbaceous perennial. 



Land Yellow Cress (Radicula pdlustris, 

 D.C. = N. terrestre, Br.). The habitat of this 

 plant is damp places. The habit is erect or 

 ascending. The stems are erect or ascending. 

 The roots are fibrous. The leaves are deeply 

 divided nearly to the base, or with lobes each side 

 of a common stalk, the lobes few, broad, oblong, 

 toothed, unequally cut, the terminal leaflet of the 

 lower leaves the largest. The flowers are small, 

 yellow, the petals not longer than the sepals. 

 There are 4 disk-glands. The pods are short, 

 turgid, linear-oblong, thick, ascending, as long 

 as the stalks, which are spreading or bent down. 

 The seeds are angular. There is a short style. 

 The plant is 6-18 inches. It flowers between June 

 and October, and the plant is a herbaceous peren- 

 nial. 



Barbarea stricta Fr. (= B. parviflora^ Fr.). 

 The habitat of this plant is river-banks, &c. The 



