62 F. Pax. — Euphorbiaceae-Acalypheae-Mercurialinae. 



15. LeUCOdOton Griseb. 



Leuoocroton*) Griseb. in Abh. Ges. Wiss. Göttingen IX. (4 860.) 20; Müll. Arg. in 

 DC. Prodr. XV. 2. (1866) 757; Baill. Hist. pl. V. (1874) 199; Benth. in Benth. et 

 Hook. f. Gen. III. (1880) 31'2; Pax in Engler u. Prantl, Pflzfam. III. 5. (1890) 51. — 

 Gonceveiba Sect. Leueocroton Post et 0. Ktze. Lexicon (1904) 138. 



Flores dioici vel rarius monoici. Calyx rf in alabastro clausus, globosus, per an- 

 thesin valvatim 3- vel 5-partitus. Slamina 7 — 15, receptaculo convexo affixa; filamenta 

 brevia, libera vel basi vix connata; antherae dorsifixae, oblongae; loculi paralleli. longi- 

 tudinaliter introrsum dehiscentes. Discus extrastaminalis annularis, integer vel lobulatus. 

 Ovarii rudimentum villosulum. Galyx Q 5-partitus. Discus hypogynus annularis, lobulatus 

 vel subinteger. Ovarium 2-loculare; styli breves, patentes, crassi, plicati, brevissime 

 2-lobi, lobis radiato-multifidis. Ovula in loculis solitaria. Capsula tridyma, in coccos 

 2-valves dissiliens. Semina ecarunculata, subglobosa, laevia; albumen carnosum; coty- 

 ledones latae, planae. — Frutices; indumentuin stellatum vel stellato-lepidotum. Folia 

 alterna, obsolete vel vix stipulata, saepius coriacea, supra glabra vel glabrescentia, 

 penninervia, rarius basi 3-nervia, reticulata. Spicae rf axillares, foliis breviores; brac- 

 teae pluriflorae; inflorescentiae Q 1 — 2-florae, inferne bracteis sterilibus pluribus or- 

 natae. - — Fig. 8 A, B. 



Species 5, omnes cubanae. 



Die Arten stehen in verschieden engem Verwandtschaflsverhältnis zueinander. L. Wrigktii 

 und L. virens sind scharf umschriebene Spezies, dagegen bilden L. angustifolius und L. leprosits 

 eine Gruppe für sich. Der monözische L. microphylhis endlich steht noch isolierter. 



Clavis specierum. 



A. Species macrophyllae ; folia ultra 4 cm longa. 



a. Folia angustissime revoluta vel margine plana, ± ovata 

 vel elliptica. 



ct. Folia penninervia, coriacea \. L. Wrigktii. 



ß. Folia basi 3-nervia, tenuiter membranacea .... 2. L. virens. 



b. Folia latiuscule revoluta, — lineari-lanceolata. angusta. 



ct. Indumentum adpressum 3. L. angustifolius. 



i'i. Indumentum leproso-flocculosum, ferrugineum . . . 4. L. leprosus. 



B. Species microphylla; folia 6 — 25 mm longa 5. L. microphyüus. 



1. L. Wrightii Griseb. in Abh. Ges. Wiss. Göttmgen IX. (1860) 21; in Mem. 

 Amer. Acad. 2. ser. VIII. (1860) 160; Müll. Arg. in DC. Prodr. XV. 2. (1866) 756. - 

 L. flavicans var. latifolius Müll. Arg. in DC. Prodr. XV. 2. (1866) 757. — L. fla- 

 vescons var. latifolius Benth in Benth. et Hook. f. (Jen. III. (1880) 312. — Groton 

 Wrigktii Griseb. in Sched ; — Frutex?; ramuli juveniles pilis stellato-lepidotis dense 

 vestiti. Petiolus 7 — 15 mm longus, basi tumido-incrassatus; limbus 8 — 18 cm longus, 

 2 — 4y 2 cm latus, lanceolatus vel spathulato-lanceolatus vel obovato-spathulatus, apicc 

 obluse vel acute acuminalus vel acutus vel rarius obtusus, basi cuneato-angustatus, 

 integer, coriaceus, supra viridis, nitidus, glaber, subtus pilis stellato-lepidotis minutissimis 

 et saepe simul majoribus densissime vestitus, subargen teo-pallidus; costae secundariae 

 utrinque 11 — 18, adscendentes." Flores dioici. Spicae rf 2 — 4 cm longae, basi breviter 

 nudae, floribundae; bracteae a basi dilatata lanceolatae, 2 — 3 mm longae, cum rhachi 

 dense vestitae, persistentes, pluriflorae. Bacemi Q 3 — 7 cm longi. apice uniflori, longo 

 tractu bracteigeri, ananthi; bracteae lineari-lanceolatae; pedicelli utriusque sexus 2 — 3 mm 

 attingentes. Calyx tf 3 mm diametiens, 3-partitus, extus et intus dense vestitus; discus 

 extrastaminalis 3-lobus, margine brevissime ciliolatus; stamina 7 — 10, basi brevissime 



Xbvxös = albus; Croton genus Euphorbiaccarum. 



