Hypericum tenuifolium Pursh

Shrub 0.1-0.5 m tall, decumbent, with branches interweaving at the base but not rooting, forming low mats, or sometimes more erect in dense vegetation. Stems reddish, 6-lined when young, eventually 4- lined, then terete; cortex exfoliating in strips or flakes; bark smooth, thin. Leaves sessile, 4-1 1 x 0.4-0.8(-1?) mm, with those in axillary clusters equal or shorter, linear-subulate, dull green above, with margin revolute, completely concealing all but midrib beneath, chartaceous, deciduous at articulation below prominent midrib base (cf. 11. brachyphyllum), apex rounded with prominent hydathode, base parallel or slightly expanded; midrib unbranched; glands dense, in 2 rows, visible beneath only. Inflorescence 1-7-flowered, without accessory flowers, with l(3)-flowered dichasia from up to 4 nodes below, rarely with one pair of flowering branches, the whole narrowly cylindric; pedicels absent or very short; bracts foliar. Flowers 10-14 mm in diam.; buds narrowly cylindric-ellipsoid. Sepals 5, (2-)2.5 4 x 0.4-0.5 mm, unequal, linear-subulate, acute to rounded, 1-veined. Petals 5, bright? yellow, spreading, 5-10 x 2-5 mm long, oblanceolate-oblong to obovate, with apiculus lateral, acute. Stamens c. 50-90, longest 4.5-8 mm, c. 0.85-0.9 x petals. Ovary 3-merous, 2-3 x 0.5-0.8 mm, very narrowly cylindric, acute; placentation parietal?; styles 3, 2-3 mm long, 0.9-1.2 x ovary, usually separating in fruit. Capsule (4-)5. 7-9.5 x 1 .5-2 mm, narrowly (sub)cylindric, exceeding sepals, thinly coriaceous. Seeds blackish, c. 0.5 mm long; testa coarsely reticulate (alveoli square to hexagonal).