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THAI FOR. BULL. (BOT.) 36: 70–80. 2008.

Additions to “Rubiaceae of Thailand. A pictorial guide to indigenous and cultivated genera”

CHRISTIAN PUFF* & KONGKANDA CHAYAMARIT**

ABSTRACT. Descriptions, notes and colour plates of four monotypic (monospecific) genera (Clarkella Hook. f., Gardeniopsis Miq., Hyptianthera Wight & Arn. and Morindopsis Hook. f.) are presented which had not been included in “Rubiaceae of Thailand. A pictorial guide to indigenous and cultivated genera” (Puff et al., 2005). Morindopsis laotica is reduced to a synonym of M. capillaris.

KEYWORDS: Clarkella, Gardeniopsis, Hyptianthera, Morindopsis; Rubiaceae; Flora of Thailand.

INTRODUCTION

Since the publication of “Rubiaceae of Thailand. A pictorial guide to indigenous and cultivated genera” (Puff et al., 2005), photographs of another four genera not covered in the book have become available. This brings the total of illustrated Thai Rubiaceae genera illustrated by us to 88 [out of c. 110], or c. 80 per cent .

All four genera are monotypic (monospecific); two are rheophytes, one obligate (Morindopsis), the other (Hyptianthera) facultative; one is a herbaceous limestone dweller (Clarkella), and the fourth (Gardeniopsis) an occupant of the lowland evergreen rain forests in the Peninsula. The names of two of the genera (Gardeniopsis, Morindopsis) are somewhat unfortunate and misleading, as they are not at all allied to their well known name sakes Gardenia and Morinda.

THE GENERA

Clarkella Hook. f., Fl. Brit. India 3: 46. 1880.

Small, ascending to erect herbs with a short, tuber-like rhizome. Stems with a solitary, relatively large basal leaf (the second completely suppressed; rarely present, but then much smaller than the other) and typically 1(–2), rarely 3, pairs of smaller, isophyllous leaves. Leaves membranous, petiolate; stipules small, entire. Inflorescence a solitary, terminal, shortly pedunculate, up to 7-(rarely more)flowered cyme; in luxuriously developed individuals sometimes, in addition, also few-flowered inflorescences in the axils of the uppermost leaf pair. Flowers (4–)5-merous, hermaphrodite. Calyx with somewhat unequal lobes, sometimes 1 lobe divided into 2. Corolla infundibular, puberulous on the outside,

  • *

    Faculty Center of Botany (formerly Institute of Botany), University of Vienna, Rennweg 14, A-1030

Vienna, Austria. ** Forest Herbarium (BKF), National Park, Wildlife and Plant Conservation Department, 61 Phahonyothin Rd., Chatuchak, Bangkok 10900, Thailand.

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