Plants subshrubs or shrubs, 0.2 - 2.5 m tall;young stems 4-angular, glabrous to scabrous or shortly pubescent. Leaves witth stipular sheaths, 0.5-2.5 mm long, usually with a few short fimbriae, blades linear to lanceolate, 1-7 cm long, 2-7 mm wide, glabrous to scabrous, margins usually revolute, margins revolute. Flowers fragrant, sessile or pedicellate, forming spike-like, raceme-like, or corymbose inflorescences; pedicels about 10 mm long; calyx-lobes linear to lanceolate, 1-6 mm long; corollas white or cream, oftern tinged with blue, purple, or green outside, corolla tubes 20-52 mm long, lobes 5-15 mm long, glabrous inside. Capsules 1.5-3 mm long, beaked, beaks 1.5-2 mm long; seeds 0.6-0.8 mm long.
Conostomium longitubum grows in deciduous bushland and on rocky hillsides at 130-1400 m. It is known from regions N1-3 and C1-2 of the Flora of Somalia and in Ethiopia and Kenya.
Habit: subshrubs or shrubs 20-250 cm tall with 4 angled stems.
Leaves linear to lanceolate, 1-7 cm wide, 0.2-0.7 cm wide, usually with revolute margins.
Inflorescences spikelike, racemelike or corymbose, the flowers sessile or on pedicels up 10 mm long.
Flowers fragrant, sessile or pedicellate, calyces with 4 linear to lanceolate lobes 1-6 mm long, corollas white or cream, often tinged blue, purple or geen externally, tubes 2-5.7 cm long (hence "longitubum"), lobes 5-15 mm long.
Fruits capsules 1.5-3 mm long with a beak 1.5-2 mm long.
Conostomium longitubum grows in deciduous bushland and on rocky hillsides at 130-1400 m. It is known from regions N1-3 and C1-2 of the Flora of Somalia and in Ethiopia and Kenya.