Pterocymbium tinctorium (Blanco) Merr., Publ. Bur. Sci. Gov. Lab. 27: 24 1905. (syn: Heritiera tinctoria Blanco; Pterocymbium campanulatum Pierre; Pterocymbium columnare Pierre; Pterocymbium macrocrater Warb.; Pterocymbium nicobaricum Didr.; Sterculia campanulata Wall. ex Mast.);
Assam to Malesia: Andaman Is., Assam, Borneo, Jawa, Laos, Malaya, Maluku, Myanmar, Nicobar Is., Philippines, Sulawesi, Thailand, Vietnam as per POWO;
Common name: Winged Boot Tree, Bellflower Sterculia
Trees, to 20 m high, bark grey-brown. Leaves simple, alternate; stipules ca. 6 mm long, subulate, cauducous; petiole 3-10 cm long, slender; lamina 10-15 x 7-12 cm, ovate or ovate-oblong, base cordate, apex acute or acuminate, margin entire, glabrous above, pubescent beneath, coriaceous; 5-7-ribbed from the base, palmate, prominent, intercostae scalariform. Flowers polygamous, in terminal umbellate panicles; calyx 1.5 x 4 cm, campanulate, glabrous, lobes 5, lanceolate; stamens 10 or 8, united to form a staminal column, pubescent below; ovary superior, 5, free, sessile, gibbous at base; styles short. Fruit a follicle, 5-9 x 1.8-2.5 cm, boat shaped with a pouch-like bulging at base, glabrous, membranous, 2-lobed, lower broad, round, upper linear, obtuse, glabrous, dehiscing before maturity; seed 1, 1 cm long, basal, ellipsoid to ovoid.
Flowering and fruiting: January-May
Raised in plantations
(Attributions- Dr. N Sasidharan (Dr. B P Pal Fellow), Kerala Forest Research Institute, Peechi as per India Biodiversity Portal (Pterocymbium tinctorium javanicum (R. Br.) Kosterm.))
tree at Agara Lake, HSR Layout, Bengaluru: 5 images.
Date/Time- Tree 28 FEB 2021, Flowers 1 on ground 28 FEB 2021, Buds 1 MAR 2021, Leaf 16 MAR 2021, Flowers 2 on ground 17 MAR2021
Location- Place, Altitude, GPS- Agara Lake, HSR Layout, Bengaluru. 12.923 N 77.642 E
Habitat- Garden/ Urban/ Wild/ Type- Urban.
Plant Habit- Tree/ Shrub/ Climber/ Herb- Tree.
Height/Length- 6 meters.
Leaves Type/ Shape/ Size- Oval with prominent veins.
Inflorescence Type/ Size- Bunches like grapes
Flowers Size/ Colour/ Calyx/ Bracts- Pentamers, two types (may be male and female)
Fruits Type/ Shape/ Size Seeds- If seen in future, I will report.
Is it Sterculia villosa ? We can confirm it now after the fruits come
I am attaching two more pictures. The images of Pterocymbium tinctorium in ‘Flowers of India’ are quite close to my images.
It appears to me that the image shows a female flower. The seeds are not formed yet.
Any Malvaceae member?
Need sometime to check. Seems to be a distinctive tree not seen earlier in Mysore or Bangalore by me.
Sterculia species. S.companulata ?????
I thought it looks more like some Sterculia : Pterocymbium tinctorium never seen this.
Thanks for showing me new one.
References: POWO Catalogue of Life The Plant List Ver.1.1 WCSP IPNI GBIF (High resolution specimens) Flora of peninsular India Flowers of India India Biodiversity Portal Kerala plants (Pterocymbium tinctorium javanicum (R. Br.) Kosterm.) Wikipedia Wikimedia Commons PROSEA Useful Tropical Plants nbrienvis pdf
Pterocymbium tinctorium (Merrill, 1901) (Magnoliophyta: Malvales: Sterculiaceae: Sterculioideae): New record from mainland India and extension of geographic distribution– June 2013 Check List 9(2)- Bikarma Singh, Dibyendu Adhikari, Saroj Barik and Arun Chettri (Abstract: We present a new record of the winged-boot tree (Pterocymbium tinctorium) discovered in the Khasi Hills of Meghalaya on the Indian mainland. With this record, the known geographical distribution of P. tinctorium is now extended up to the foothills of the Eastern Himalayas in Southeast Asia. The species was recorded from the tropical moist deciduous forests of Meghalaya. The habitat of P. tinctorium was characterized by the presence of surface lime-stone with karst topography. Future investigations should aim at identifying the factors responsible for the restricted distribution of this species so that appropriate conservation measures can be taken.)