Piper hymenophyllum

Description

Scandent or creeping shrub, climbing branches rooting at nodes. Stem ridged, pubescent with recurved hairs. Petiole 0.5-1 cm long, pubescent, vaginate to apex; blade not conspicuously glandular-dotted, elliptic, subobovate or ovate, 4-17 x 3-6.5 cm, (on young creeping branches ca. 1.5-5 x 0.8-1.8 cm), margin occasionally ciliate, apex (long-)acuminate, base unequally attached to petiole difference 0.1-0.7 cm, unequally cordate or obtuse, glabrescent but veins may be recurved-pubescent; pinnately veined, secondary veins 6-8 per side, originating from throughout primary vein, impressed above, prominent below, tertiary veins inconspicuously reticulate. Inflorescence horizontally oriented? later recurved; peduncle 0.8-2 cm long, pubescent or glabrescent; spike protandrous (presenting staminate flowers first, pistillate flowers afterwards), 1-3.5 cm long, green, not apiculate; floral bracts pubescent at base, densely marginally fringed; stamen 1 per flower, far exserted, recurved, 2-3 mm long. Fruits obovoid to depressed globose, glabrous, stigmas 3 or 2, recurved, 0.5-1 mm long.

Distribution

Guianas: present Southern America:
The Guianas and Brazil; 34 collections studied (GU: 4; SU: 16; FG: 14).

Notes

This creeping species is easily recognized by the difference in flowering pattern. At first sight the species seems to be dioecious, but actually it is protandrous. The flowers are unique in the Guianan species in having only one stamen. The stamen has long filament that elongates before the ovary develops.
There is a great variety in leaf measurements, which may result in incorrect identification of immature collections.
When Wight used the name Piper hymenophyllum, illustrating his own specimen from India, he did not realize that this specimen did not belong to Miquel's species. Despite this, his new combination applies to the basionym, Artanthe hymenophylla.
De Candolle in transferring Nematanthera guianensis to Piper nematanthera cited two collections: Hostmann 19 (which is an error, because the number 10 is clearly written on the Kew voucher) and Kappler 1438. Miquel only mentioned the Kappler specimen which thus is the type of Nematanthera guianensis.
Trelease and Yuncker reduced Piper sagotii to variety sagotii under P. nematanthera. They indicated that additional material might show intermediate leaf shapes and measures. In Jonker & Jonker-Verhoef 418 there is a young, creeping branch bearing leaves of ca. 1.7 x 0.8 cm, the size of leaves in var. sagotii, whereas the leaves on the other branches are up to 17 x 6 cm, the size as described for the typical variety. To conclude, there is no reason to maintain var. sagotii.

Synonymy

Piper hymenophyllum (Miq.) Wight in Icon. Pl. Ind. Orient. 6: t. 1942. 1853 sec. C.A. Todzia & al. 2006
  • Artanthe hymenophylla Miq., Syst. Piperac.: 532. 1844
  • Piper kegelii C. DC. in A. DC., Prodr. 16: 323. 1869, nom. illeg.
    • Isotype: Hostmann 217 (U).
    • Holotype: Hostmann 217.
    • Isotype: Hostmann 217.
  • =Nematanthera guianensis Miq. in Linnaea 18: f. 11. 1845
  • Piper nematanthera C. DC. in A. DC., Prodr. 16: 367. 1869
  • =Piper sagotii C. DC. in J. Bot. 4: 162. 1866
  • Piper nematanthera var. sagotii (C. DC.) Trel. & Yunck., Piperac. N. South Amer.: f. 339. 1950
    • Isotype: French Guiana, Maroni, Sagot 1255.
    • Holotype: French Guiana, Maroni, Sagot 1255.

Images

Specimens

CountryDateCollector + collecting numberHerbariaTypeScanDerivatives
Sagot 1255
Citation: French Guiana, Maroni, Sagot 1255.

Specimen summary: French Guiana, Maroni, Sagot 1255.
Isotype of Piper sagotii C. DC. Piper nematanthera var. sagotii (C. DC.) Trel. & Yunck.
Holotype of Piper sagotii C. DC. Piper nematanthera var. sagotii (C. DC.) Trel. & Yunck.

Guyana, Republic ofJenman 1851
Citation: Guyana, Republic of, Canje R., Jenman 1851.

Guyana, Republic ofClarke 3951
Citation: Guyana, Republic of, Upper Takutu — Upper Essequibo region, Rewa R., Clarke 3951.

Hostmann 217U
Citation: Hostmann 217.

Specimen summary: Hostmann 217.
Isotype of Piper kegelii C. DC. Piper hymenophyllum (Miq.) Wight Artanthe hymenophylla Miq.
Holotype of Piper kegelii C. DC. Piper hymenophyllum (Miq.) Wight Artanthe hymenophylla Miq.

Specimen summary: U
Isotype of Piper kegelii C. DC. Piper hymenophyllum (Miq.) Wight Artanthe hymenophylla Miq.

Feuillet 719
Citation: Paul Isnard region, Feuillet 719.

Suriname, Republic ofGörts-van Rijn et al. 505
Citation: Suriname, Republic of, Brownsberg, Görts-van Rijn et al. 505.

Suriname, Republic ofLBB 11057
Citation: Suriname, Republic of, Kamisa Falls, LBB 11057.

Suriname, Republic ofMennega 558
Citation: Suriname, Republic of, Upper Coppename R., Raleigh Falls, Voltzberg, Mennega 558.

Suriname, Republic ofJonker & Jonker-Verhoef 418
Citation: Suriname, Republic of, Upper Nickerie R., camp Powiesi Boutoe, Jonker & Jonker-Verhoef 418.