''Pseuduvaria macgregorii'' is a species of

plant Plants are predominantly photosynthetic eukaryotes of the kingdom Plantae. Historically, the plant kingdom encompassed all living things that were not animals, and included algae and fungi; however, all current definitions of Plantae exclud ...

in the family Annonaceae. It is native to The

Philippines The Philippines (; fil, Pilipinas, links=no), officially the Republic of the Philippines ( fil, Republika ng Pilipinas, links=no), * bik, Republika kan Filipinas * ceb, Republika sa Pilipinas * cbk, República de Filipinas * hil, Republ ...

Elmer Drew Merrill Elmer Drew Merrill (October 15, 1876 – February 25, 1956) was an American botanist and taxonomist. He spent more than twenty years in the Philippines where he became a recognized authority on the flora of the Asia-Pacific region. Through t ...

, the American botanist who first formally described the species, named it after Richard MacGregor the Australian ornithologist and plant collector who collected the specimen Merrill examined.

Description

It is a small tree reaching 6 meters in height. The young, light brown to gray branches are very densely hairy, but become hairless when mature. Its elliptical to egg-shaped, papery to leathery leaves are 18.5-36 by 9-15 centimeters. The leaves have blunt bases and tapering tips, with the tapering portion 7-14 millimeters long. The leaves are hairless on their upper and lower surfaces except on their midribs which are sparsely to densely hairy. The leaves have 20-26 pairs of secondary veins emanating from their midribs. Its very densely hairy petioles are 6-13 by 2-5 millimeters with a broad groove on their upper side. Its

Inflorescence An inflorescence is a group or cluster of flowers arranged on a stem that is composed of a main branch or a complicated arrangement of branches. Morphologically, it is the modified part of the shoot of seed plants where flowers are formed o ...

s occur in clusters of 2–7 on branches, and are organized on indistinct peduncles. Each inflorescence has up to 14 flowers. Each flower is on a very densely hairy

pedicel Pedicle or pedicel may refer to: Human anatomy *Pedicle of vertebral arch, the segment between the transverse process and the vertebral body, and is often used as a radiographic marker and entry point in vertebroplasty and kyphoplasty procedures ...

that is 5-12 by 0.3-0.8 millimeters. The pedicels are organized on a rachis up to 5 millimeters long that have 4-14

bract In botany, a bract is a modified or specialized leaf, especially one associated with a reproductive structure such as a flower, inflorescence axis or cone scale. Bracts are usually different from foliage leaves. They may be smaller, larger, or of ...

s. The pedicels have a medial, very densely hairy

that is 0.5-1.5 millimeters long. Its flowers are unisexual. Its flowers have 3 free, triangular

sepals A sepal () is a part of the flower of angiosperms (flowering plants). Usually green, sepals typically function as protection for the flower in bud, and often as support for the petals when in bloom., p. 106 The term ''sepalum'' was coined b ...

, that are 0.8-1 by 1 millimeters. The sepals are hairless on their upper surface, very densely hairy on their lower surface, and hairy at their margins. Its 6 petals are arranged in two rows of 3. The white to pink, oval, outer petals are 1.5-3 by 2-2.5 millimeters with hairless upper surfaces and densely hairy lower surfaces. The white to pink, triangular inner petals have a 1 millimeter long claw at their base and a 3 by 1.5-3 millimeter blade. The inner petals have falt bases and pointed tips. The inner petals are hairless on their upper surfaces, and slightly hairy on their lower surfaces. Male flowers have 42-45

stamen The stamen (plural ''stamina'' or ''stamens'') is the pollen-producing reproductive organ of a flower. Collectively the stamens form the androecium., p. 10 Morphology and terminology A stamen typically consists of a stalk called the filame ...

s that are 0.6-0.7 by 0.6 millimeters. The fruit occur in clusters of 3–6 on slightly hairy pedicles that are 17-25 by 0.7-2 millimeters. The green, elliptical fruit are 9-16 by 7-17 millimeters. The fruit are wrinkly with ridges or bumps, and sparsely hairy. Each fruit has up to 2 spherical seeds that are 10 by 9-10 by 5-6 millimeters. The seeds are wrinkly.

Reproductive biology

The pollen of ''P. macgregorii'' is shed as permanent tetrads.

Habitat and distribution

It has been observed growing in lowland forests at elevations of 100–130 meters.

References

{{Taxonbar, from=Q17135080 macgregorii Flora of the Philippines Plants described in 1926 Taxa named by Elmer Drew Merrill