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Botanical Museum and Herbarium, Utrecht) Notes on the Araceae of Surinam IIIt 1 ) A.M.E. Jonker-Verhoef AND F.P. Jonker (Botanical Museum and Herbarium, Utrecht) (received November 15th, 1965) After the publication of part I and part II of this series a number the of Aroids were collected in interior of Surinam, chiefly by A. G. H. Daniels and F. P. Jonker during an expedition to the Emma in 1959. The is Range following an enumeration of species collected for the first time in Surinam in addition to records of recollections of rare taxa and critical notes on misinterpreted or confused species. authors also The present examined those specimens collected by J. van Donselaar and W. A. E. van Donselaar-ten Bokkel Huinink (1958/59), K. U. Kramer and W. H. E. Hekking (1960/61), J. G. Wessels Boer (1963), J. P. Schulz (1963) and P.A. Florschütz and P. J. M. Maas (1964/65). Dracontium L. Dracontium foecundum Hook. f. was collected for the first time in Surinam by P. A. Florschiitz and P. J. M. Maas. The species was hitherto known from British Guiana and Trinidad only. It is closely related to D. asperum K. Koch, differing only in its much longer peduncle (30 cm or more) which in D. asperum is about 15 as long as the spathe (up to cm). For description and literature, see Jonker and Jonker in Flora of Suriname 7-8. 1 pt. 2, 1953, p. Lower Suriname Riv., plant. Peperpot (Florschiitz and Maas 3162, fl. March 1965 [U]). Cyrtosperma Griff. Up till now a single species - C. spruceanum (Schott) Engl. - was known from Surinam and only collected on a single occasion. Another French been species was only known from Guiana and has now found in S. Surinam as well. Cyrtosperma americamm Engl, in Mart., Flor. Bras. III. 2 (1878), p. 117, tab. 22; Engler in D.C., Mon. Phan. II (1879), p. 272; Das Pflanzenreich IV. 23 C 8. Engler, (1911), p. 22, Fig. Terrestrial herb; each plant provided with a single leaf and an 60 inflorescence. Leafblade sagittate-tripartite, herbaceous, up to cm wide. lobe 38 lateral Apical triangular, up to cm long, pinnatipartite; x Part in Acta Botanica ) I Neerlandica 2, 1953, p. 349-362 (also published as Mededelingen van het Botanisch Museum en Herbarium, Utrecht, no. 118); II in Acta 139-155 part Botanica Neerlandica 8, 1959, p. (Mededelingen no. 154). 130 NOTES ON THE ARACEAE OF SURINAM 111 131 segments up to 20 cm long and 6 cm wide, often forked at the apex; and apical segment elongate-rhomboid, up to 20 cm long 17 cm wide. Basal the exterior of main the lobes on side their ribs pinnatifid, on Sinus inner side entire, up to 30 cm long. between the basal lobes the main ribs of the the denudate penetrating to latter, part up to 5 cm long. Petiole rough, brown-blotched, up to 130 cm long; basal part vaginate, 10-20 cm long. Peduncle rough, especially in the basal 110 with in the part, up to cm long. Spathe white, tinged purple basal part, or brown-purple, up to 25 cm long; the apical part spirally twisted, acute, shortly subulate. Spadix stipitate, shortly cylindrical, 3.5 and 0.7 in 1-2 obtuse, up to cm long cm diameter; stipe cm long. and Tepals 4, cucullate, circ. 2.3 mm long 2-2.3 mm wide. Filaments rather broad, ribbon-shaped, circ. 2 mm long and 1-1.8 mm wide; anthers circ. 0.6 mm long. Ovary ovoid to pear-shaped, circ. 2.3 mm 1.8 1-locular long and mm wide, with a single, basal ovule. Distribution: French Guiana. of Paloemeu in Junction Riv. and TapanahoniRiv., marshy creek valley among shrubs (Wessels Boer 1223, fl. Apr. [U]). This species differs from A. spruceanum in the basal lobes of the tripartite leaf. These are pinnatifid on both sides of their main ribs the in C. spruceanum and entire on the inner side and pinnatifid on ribs C. americanum. exterior side of their main in The ovary contains in C. 2 ovules in C. spruceanum and 1 americanum. The seeds are smooth in C. spruceanum and cristate in C. americanum. Anthurium Schott I. Anthurium crassinervium (Jacq.) Schott, a species already collected three times in the interior, appeared to be rather common in the both dolerite and Vid. Emma Range on bare rock, granite. I, p. 352. 139. II, p. Daniels and Jonker 807, 1285, 1286 [U], 2. Anthurium Schott. As mentioned before Anthurium huegelii (I, p. 322) crassinervium (Jacq.) Schott was often confused with A. hookeri Kunth latter included A. Schott. We and in the Engler wrongly huegelii agree with N. E. Brown (1910) and Simmonds (1950) in considering this It the in a distinct species. was collected in Surinam for first time Emma in Mountains the Range and later on the Wilhelmina also. in Anthurium huegelii Schott, Prodr. (1860), p. 469; N. E. Brown Gard. Chron. 48 Simmonds in Kew Bull. (1910), p. 153; (1950), in Neerl. — p. 395; Jonker and Jonker Act. Bot. 2 (1953), p. 352; Anthurium trinitatis Das Pflanzenr. IV. 23 B 73. Engl., (1905), p. A usually epiphytic rosulate herb, according to Schulz also ter- restrial (In Trinidad, according to Simmonds saxicolous in the drier moister districts and epiphytic on trees in the ones). Petiole sulcate, Leaf blade 5-19 cm long; joint 0.6-1.5 cm long. subcoriaceous, 132 A. M. E. JONKER—VERHOEF AND F. P. JONKER the obtuse spathulate, acute and mucronate at apex, decurrent to at and wide. base, 75-90 cm long 21-31 cm Peduncle slender, 40-75 cm long. Spathe lanceolate, mucronate, amplectant, 5—19 cm long and 0.8-2 with red outside. almost cm wide, green tinged Spadix 8-27 and to 1 in sessile, narrowly cylindrical, cm long up cm diameter, vivid bluish-purple. Tepals cucullate, circ. 1.5 mm long and 1—1.5 mm wide. Stamens circ. 1 mm long and 0.2-0.4 mm wide. Ovary 1.5 1.5 in cylindrical, 2-locular, circ. mm long and mm diameter; each cell containing a single ovule inserted in the middle of the dissepiment. Stigma sessile, discoid. Berries obovoid, white at base and purple at apex. Distribution: West-Indian Islands, British Guiana. Emma Range, Hendriktop, S slope, upper limit of cloud forest, alt. 950 m (Daniels and Jonker 955, fl. Aug. 1959 [U]); Wilhelmina Mountains, Julianatop, alt. 1000 m (Schulz 10281, fl. Aug. 1963 [BBS, U]). This species differs from A. crassinervium (Jacq.) Schott in its much shorter petiole and the subcoriaceous spathulate leaf blade which is the base in its white with slightly truncate at and, moreover, purple, in crassinervium. obovoid berries which are scarlet and ellipsoid A. 3. Anthurium jenmanii Engl., a species new to Surinam, belonging in the characterized its the same group as preceding species, chiefly by leaf shape. Das Pflanzenreich IV. 23 B 72. Anthurium jenmanii Engl., (1905), p. Terrestrial, rosulate herb. Petiole stout, sulcate, 11-12 cm long and Leafblade 1 cm in diameter; joint 0.5-1 cm long. coriaceous, elliptic- acuminate and the rounded to al, acute or mucronate at apex, base truncate at the base, 48-75 cm long, 20-37 cm wide; truncate 1 6-7 cm wide; midrib prominent. Peduncle 40-80 cm long and cm and in diameter. Spathe lanceolate, acuminate, 8-16 cm long up to 1.5 cm wide. Spadix shortly oblique-stipitate, long and narrowly 9-24 cylindrical, tapering towards the apex, purple-brown, cm long and 1 in to 1 cucullate, up to cm diameter, stipe up cm long. Sepals circ. 1.5 mm long and 2 mm wide; petals circ. 2 mm long and 2 mm and 1 wide. wide. Stamens circ. 2.25 mm long mm Ovary cylindrical, 1 in cell 2-locular, circ. 2 mm long and mm diameter; each containing of the a single ovule inserted in the middle dissepiment. Stigma sessile, discoid. Distribution: British Guiana, Trinidad, Colombia. and Emma Range, Wosuna fall, alt. 300 m, on granite slope (Daniels Jonker 833, fl. Aug. 1959 [U]). Note: Simmonds 82 (Herb. Trinidad 13883), Trinidad, cited by in Kew Bull. under A. Schott Simmonds 1950, p. 395, huegelii belongs from Trinidad. to this species and is, consequently, the first record Lambert (in Claes) 2899, fl. Nov. 1926 [BR], represents the first collection from Colombia. NOTES ON THE ARACEAE OF SURINAM lit 133 4. Anthurium lanjouwii Jonk. et Jonk., n. sp. (Fig. 1) Herba terrestris rosulata. Caudex brevis, cylindricus ad 15 cm longus; cataphylla lanceolata ad 3.5 cm longa et 1.8 cm lata, mox in libras tenues resoluta. Internodia 1 Petiolus 7-23 ad 1 ad 0.5 cm longa, cm crassa. semiteres, cm longus geniculo cm longo instructus. Lamina coriacea, elliptica, basi obtusa vel cuneata, apice 9-19 Pedunculus acuminata et mucronata, 23-36 cm longa, cm lata. 17-35 cm ad longus. Spatha lanceolata, mucronata, 4.5 cm longa, 0.8 cm lata. Spadix 0.2-0.6 cm Ovarium breviter stipitatus, 5-14 cm longus, crassus. 2-loculare; loculis uniovulatis. Holotypus: Daniels et Jonker 1241 in herbario U, e Surinam© in montibus Emmaketen australibus. Paratypi: Daniels et Jonker 1101 in cacuminae mentis IJzermantop, Emmaketen [U]; Daniels et Jonker 1264 in montibus Emmaketen australibus [U], Derivatio nominis: Prof. Dr. J. Lanjouw herbarii Rheno-Traiectini. Terrestrial rosulate herb. Stem to 15 cylindrical, up cm long, covered adventitious and lanceolate densely by roots cataphylls, up to 3.5 cm long and 1.8 cm wide, or their fibrous remains. Internodes 0.5 and circ.
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