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Broadleaf cattail
Reedmace family
Herbaceous perennial plant with upright stem up to 2 m high, growing on the banks of rivers, brooks and lakes, on swamps. Leaves near the stem base, rigid, linear, bluish-green, up to 2 cm wide. Flowers small, in cylindrical spadix inflorescence at the upper end of the stem. Male flowers clustered on more narrow upper part, female – on the lower, wider part of the inflorescence. The perianth of the female flowers divided into numerous hairs forming a pappus of a small nut-shaped fruit. It is widely distributed in the moderate zone of the Northern and Southern Hemispheres, in Kamchatka occurs mostly in the valley of Kamchatka river and its tributaries.

Old man's beard; traveller's joy
Buttercup family
Herbaceous perennial with upright or climbing stem up to 60 cm long. Grows on forest margins, meadows and among shrubs, on stony slopes near rocks, alpine tundras. Leaves 1-2-pinnately compound, on long petioles, leaflets broad-lanceolate, up to 6 cm long, 3 cm wide, smoth edged or with 2-3 big teeth, the uppermost often modificated into tendril. Flowers solitary, drooping, spherical-campaniform, violet-brown or brown. Fruits – brown, densely haired nutlets, ending with lengthened pinnate-haired style. It is distributed in the moderate zone of Eastern Siberia and the Far East, in Kamchatka it is usual in the inner parts of the peninsula.

Kamchatka daphne
Thymelaea family
Shrub up to 0.5 m high, with numerous underground branchings of shoots from the root. Grows in birch forests, on herb meadows along above-flood-land terraces of rivers and brooks, in high herb thickets near hot springs. Branches greyish-brown, naked. Leaves oblong-obovate, 4-7.5 cm long, 1.5-2.5 cm wide, on the shoot tips. Flowers pale-yellow, almost white, sessile on the branches little lower than flowers. Fruit – bright-red berry. An endemic of Kamchatka, it is distributed from Apachinskie hot springs in south to Tigil in the north. One of early blossoming and most poisonous (all parts) plants of Kamchatka.

Some of the vernacular names used are also not the most widely known ones; the first species (I presume Typha latifolia) is better called Common Bulrush, and its family (Typhaceae) the bulrush family.

Also a few small grammar and wording improvements:
"Herbaceous perennial plant with upright stem" would be better as "A herbaceous perennial plant with an upright stem"
"Flowers small, in cylindrical spadix" would be better as "Flowers small, in a cylindrical spadix"
"in Kamchatka occurs mostly in the valley of Kamchatka river and its tributaries" would be better as "in Kamchatka occurs mostly in the valley of the Kamchatka River and its tributaries"
"It is distributed in the moderate zone of Eastern Siberia and the Far East, in Kamchatka it is usual in the inner parts of the peninsula" would be better as "It is distributed in the temperate zone of eastern Siberia and the Far East; in Kamchatka it is found in the inner parts of the peninsula"

Resin