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Project Name Data (Last Modified On 1/14/2013)
 

Flora Data (Last Modified On 1/14/2013)
Genus PHTHIRUSA Mart.
PlaceOfPublication Flora 13:110. 1830;
Reference Rizzini, in Dusenia 3 (6): 451. 1952.
Description Erect or scandent shrubs, the latter developing aerial roots. Leaves mostly leathery. Flowers often very tiny, tetra-hexamerous, in ternations; these in racemes, spikes, panicles or rarely subsolitary; bractlets connate. Stamens unequal, the filaments of the longer scalloped at both sides by pressure of the anthers of the shorter ones. Pollen grains of one type; triangular in shape, the exine finely granulose, showing three pores. Pistillate flowers with staminodia; staminate ones with vestigial style, this lacking stigma; androgynous flowers sometimes occur. Buds of the male flowers terete. Fruit baccate as in Struthanthus.
Habit shrub
Distribution A genus of about 55 species, widely distributed throughout South America and the West Indies.
Note It differs from the preceding by the combination of scalloped filaments, pollen grains of one type and terete male buds; thus, despite the opinion of Baehni and Macbride (Candollea 7:287-290. 1936-1938), it seems best to maintain it as a genus (see also Rodriguesia 18-19:87-234. 1956).
Key a. Leaves acute or acuminate. Inflorescence several together or branched. Flowers 4-6 mm. long. b. Flower clusters pedicellate, panicled ....................................................... 1. P. ADUNCA bb. Flower clusters borne in spikes, sessile ................................................... 2. P. PITTIERI aa. Leaves obtuse or nearly so. Inflorescences mostly solitary, unbranched. Flowers 1-2 mm. long ......................................................... 3. P. PYRIFOLIA
 
 
 
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