Engler's Bogbutton

Herbs, short-lived perennial, solitary or cespitose, forming low domes of rosettes, 6--15 cm. Leaves mostly linear-triangular, 2--4 cm, apex acute. Inflorescences: scape sheaths shorter than or as long as principal leaves; scapes filiform, distally 0.4 mm thick, 4--5-ribbed, glabrous; mature heads dark brown or reddish brown, nearly globose, usually short cylindric by seeding time, 3--4 mm; receptacle densely pilose; involucral bracts soon reflexed, brown, mostly ovate, 1(--1.5) mm, apex broadly acute to obtuse, surfaces glabrous or apex sparsely pilose, hairs translucent, club-shaped; receptacular bracts, dark brown, broadly spatulate or obovate-cuneate, concave, with broad, low, pale keel, 1--1.5 mm, apex short-acuminate, glabrous or abaxial surface with translucent, club-shaped hairs distally. Staminate flowers: sepals 3, dark brown, narrowly spatulate to oblanceolate-cuneate, concave, 1 mm, glabrous or abaxially with scattered translucent, club-shaped hairs distally; androphore pale, narrowly obconic, as long as sepals, glabrous, rarely apex with few club-shaped hairs; stamens 2--3, appendages (2--)3. Pistillate flowers: sepals 3, dark brown, spatulate-oblong, concave, 1 mm, abaxially sparsely pubescent distally, hairs translucent; gynoecium 3-carpellate; styles: apex 3-cleft, appendages 3. Seeds rich translucent brown, broadly ovoid to ellipsoid, 0.4--0.5 mm, longitudinal ribs conspicuous and pale, transverse striae fine forming linear cancellae.

Ala., Fla.

Flowering summer--fall.

Moist sandy-peaty lake and pond shores, drawdowns, ditchbanks, low sandy clearings in savanna and flatwoods; of conservation concern; 0--100m.

Lachnocaulon engleri Ruhl. in Engler, Pflanzenreich 4 ! ": 241
1903.
Stems much abbreviated; leaves few, tufted or subrosulate, mostlj erect, olivaceous,
rather broadly linear, 1 .5-3 cm. long, about 1 mm. wide at the middle, gradually narrowed from base to the rather acute apex, obsoletely many-nerved, not fenestrate, several julcate beneath, the margins on young leaves very sparsely ciliate with rather long soft hairs, soon glabrescenl peduncles densely aggregate, 7-30, mostly very numerous, greenish-stramineous, 3-9 cm. long, deeply 3-costate with the costae again sulcate, twisted, glabrous; sheaths rather loose, about equaling the leaves or somewhat shorter, rather obscurely striate, glabrous, obliquely split at apex, the blade acuminate, the mouth at first very sparsely and loosely ciliolate, soon glabrescent; heads hard, nigrescent, cylindric-elongate when mature, subglobose when young, 3-7 mm. long, 3-5 mm. in diameter, very sparsely villose; involucral bractlets grayish-olivaceous, obovate, obtuse or subacute, white-villose toward apex on the back, becoming calvescenl . receptacle pilose; receptacular bractlets dark-olivaceous, spatulate, about equaling the florets, subcarinate, comose toward apex; hairs of the perigonium and receptacular bractlets grayishflavidulous, clavate-obtuse, non-tuberculate, conspicuously granulose within; staminate florets: sepals obovate or spatulate, greenish-fuscous (lighter in color at base), obtuse, concave, connate at base, pilose on the back toward apex, finally calvescent; anthers whitish, oblong-ovate; pistillate florets: sepals olivaceous-fuscous, obovate, concave, rather obtuse, subconduplicatecarinate, pilose on the back at apex when young, finally calvescent; petals reduced to hairs; style shorter than the ovary, its appendages 3, short, papillose at apex; stigmas 3, simple, longer than the style-appendages; ovary globose-ovate, 3-locular.
Type locality: Ditches and lake shores in the vicinity of Eustis, Lake County, Florida {Nash 1184).
Distribution: Damp sandy and springy places, Florida. Erroneously reported from the West Indies.

Lachnocaulon engleri là một loài thực vật có hoa trong họ Eriocaulaceae. Loài này được Ruhland mô tả khoa học đầu tiên năm 1903.