UODHVA GANAPATHI
Appearance:

Purva Phalguni or Pooram Nakshatra is related to Urdhva Ganapati.
In this form, Lord Ganesha appears in a tantric posture with his consort Shakti(Devi) on his left lap.
with eight hands and golden hue complexion.

On his main right hand holds his tusk and the main left hand is gently around his Shakti. On the other hand holds sprig of paddy, a lotus, a blue lily, a sugar cane bow, arrow and a mace.
Mantra:

atha UrdhvagaNapatidhyAnaM || mudgalapurANE ||

kalhArashAlikamalEkShukacApabANa |
daMtaprarOhagadabhRutkanakOjjvalAMgaH |
AliMganOdyatakarO haritAMgayaShTyA |
dEvyA karOtu shubhamUrdhvagaNAdhipomE || 16 || kanakavarNaH

Mantra (Easy to read):

atha uodhva ganapati dhyaanam || mudgala puraane ||

Kalhaara Shali Kamalekshuka Chapa |
Bandanta Prarohakagadi Kanakojwalangaha |
Alinganaodhatakaro Harithangashtaya |
Devya Karotu Shubhaha Murdhva Ganadhipo Mey || 16 || kanakavarnah
Mantra Translation:

The Rising Ganapati, seated with his Shakti on his left thigh. He has eight arms. He is golden in colour. His hands hold the single tusk, the arrow-flower, the daylight lotus, the blue lily (kalhara), the sugar-cane bow, the paddy ear, the club; his last hand claps the goddess. The extremity of his trunk is rolled around the right breast of the goddess.
Mantra Benefits:

Worshipping this form is believed to help the devotees from all sorts of difficulties by giving them refugee and elevate devotees up in their life.