DISA. 145 
D. ophrydea, from which it may readily be known by its paler and 
smaller flowers; and D. reticulata, from which it differs by its thicker 
and less acuminate bracts, and longer and thicker spur. 
§ 2. Hudisa. 
Flowers solitary, blue. 
Odd sepal long-spurred se an Abe, D. LonGIcoRNv 9. 
Odd sepal without spur D. macurara 10. 
Flowers 1-4, very large and showy of .. OD. untrtora 11. 
Flowers in loose few-flowered iis erinit pe. of galea 
obtuse, inflated . be ne ae .. D. ocenuata 12. 
Flowers in dense or many- Sdowered pie. 
Spur of the odd sepal 4 in. long. 
Odd sepal obtuse, lip obovate .. as ne D. cornora 13. 
Odd sepal acute, lip oblong or lanceolate .. .. OD. muuta 14. 
Spur of the odd sepal less than # in. long. 
Spur intrusely set, straight and thin; flowers large D. TENuIcornts 15, 
Spur tapering, acute; flowers very small D. TENELLA 16. 
Spur very short and obtuse. 
Flowers tawny-yellow and white; rostellum with 
amedial tooth .. ae .. D. tasuuaris 17. 
Flowers lilac or purple; rontalitita tae toothed 
in the middle .. aa D. optusa 18. 
Flowers, and the whole lene green or dull 
greenish- yellow .. Se oe or .. D. cyzinprica 19. 
Spur none D. tinzata 20. 
9. Disa longicornu, Linnaeus, the younger, in Suppl. to Syst. Veg. 
(1781), p. 406.—Glabrous, decumbent, 4-6 in. long; leaves 3 to 5, 
chiefly at the base of the stem, oblong, acute, or acuminate, petiolate, 
sometimes waved, laxly spreading, 2-3 in. long; stem clothed with 
2-3 loose, membranous, acute, veined sheaths; bract like the sheaths, 
but loosely spreading from the base, or reflexed, about as long as the 
ovary; flower solitary; side sepals oblong, subobtuse, mucronulate, 
spreading, about 1} in. long; odd sepal galeate, somewhat funnel-shaped, 
with a very wide mouth, erect or turned backwards, about 1 in. high, 
with a tapering decurved spur, curved and obtuse at the apex, about 
14 in. long; petals linear, acuminate, with an obtuse decurrent lobe 
on the outer side, turned backwards into the spur of the galea and 
reaching nearly to its apex, 14 in. long; lip ovate, acute, with a 
prominent midrib 1 in. long; anther resupinate; rostellum low, the 
arms nearly parallel; ovary straight, clavate, scarcely an inch long. 
D. longicornis, Thunberg, Prodr. Fl. Cap. (1794), p. 4; ib., Flor. Cap., 
ed. 1823, p. 8. 
Has. Amongst moss or grass in clefts of steep rocks (krantzes) on the sides 
turned from the sun, where the water drips in early summer, on Table Mountain, in 
several places, from 2100 to 3000 ft., fl. Dec.—Jan., Thunberg, Bolus, 4818; Herb. 
Norm. Austr.-Afr., 161. 
