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Project Name Data (Last Modified On 12/19/2012)
 

Flora Data (Last Modified On 12/19/2012)
Genus PSIDIUM L.
PlaceOfPublication Spec. P1. 470. 1753.
Synonym Guiava [Tourn.] Adans. Fam. 2:88. 1763. Acca Berg, in Linnaea 27:138. 1856. Calyptropsidium Berg, loc. cit. 349. 1856.
Description Shrubs or trees. Leaves opposite or subalternate, the lateral nerves mostly ascending, arcuate-anastomosing without forming a distinct marginal nerve. Inflorescence cymose, 1- to 7-flowered; peduncles in the axils of the lower often bract-like leaves of lateral branchlets. Flowers large or medium-sized. Receptacle produced above the ovary. Calyx closed in the bud or open and then truncate or 5-lobed, at anthesis irregularly 3- to 5-fid, sometimes at length irregularly circum- scissile. Petals 5, orbiculate or obovate, white. Stamens numerous, the filaments incurved in the bud; anthers dorsifixed, dehiscing longitudinally. Ovary 2- to 7-celled, many-ovulate; placenta 2-lamellate; ovules in a single or triple row; stigma capitate or peltate. Berry mostly globose, many-seeded; seeds embedded in pulp, the testa dull, hard. Embryo incurved; radicle elongated; cotyledons very short.
Habit Shrubs or trees
Note Species about 60 in tropical America. A few species are cultivated throughout the tropics of the world for their edible fruits.
Distribution Species about 60 in tropical America.
Key la. Calyx open in the bud; leaves small, subsessile ......................................... 1. Ps. SALUTARE b. Calyx closed in the bud; leaves shortly petiolate ......................................... 2 2a. Plants glabrous. ......,..,..,,,,.,....,............,,,,..,,...,.3 b. Plants pubescent. ...................................................................................4 3a. Leaves 2.5-5.0 cm. long; young twigs subterete ......................................... 2. Ps. SARTORIANUM b. Leaves 8-12 cm. long; young twigs narrowly 4-angled ............................. 3. Ps. FRIEDRICHSTHALIANUM 4a. Leaves usually with 12 or more pairs of close parallel lateral nerves impressed above; young twigs 4-angular ..............................,........... 4. Ps. GUAJAVA b. Leaves usually with 7-10 pairs of remote arcuate nerves not impressed above; young twigs compressed or subterete ............................................. 5. Ps. GUINEENSE
 
 
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